Cleaning without Chemicals - Vacuum Cleaner

Many people are concerned about using chemicals during cleaning as they are perceived to be potentially harmful to the environment and the person using them. No one wants to use chemicals unless they have to, so cleaning methods that reduce or remove the need for them are becoming more popular and dry steam cleaning is one of them.

Using dry steam for industrial cleaning

The efficacy of steam as a cleaning medium has been known for many years and has demonstrable benefits in carrying out industrial cleaning. The basic principle of a dry steam cleaner is that, by putting the water in the boiler under pressure, the boiling point of the water is raised to achieve saturated steam i.e. steam with insignificant water content – usually 5-6%. Steam produced in a pressure washer, for example, has a high water content which may be adequate for some cleaning, but it does not effectively sanitise a surface. Effective sanitation is only achieved where the temperature of the steam is above 140°C when micro-organisms such as bacteria and dust mites will be killed. The high temperature of the steam emulsifies oil and grease as well as destroying germs, which allows the liquefied residue to be removed by vacuum or other means such as a micofibre cloth. A dry steam cleaner can be used on most surfaces except those that are very sensitive to heat. The advantage of this type of cleaner means both a reduction in the use of chemicals and also in water usage, which benefits both the environment and the personnel using it.

Why use a dry steam cleaner

A dry steam cleaner is a versatile cleaning machine that has the advantage of leaving a surface not only looking clean but also being thoroughly sanitised. They can be used in a variety of industrial and commercial settings including hospitals, schools, shopping centres and office buildings. There are also machines designed specifically for chewing gum removal which is a problem for many local authorities and businesses.
Before buying or hiring a steam cleaner there are a few things to consider including:

• The boiler should be made of stainless steel to provide more resistance to lime scale.
• Does the cleaner have continuous water fill?
• The dry steam cleaner should be robustly constructed as it is being used in an industrial environment, with possibly a number of different operators.
• There should be accessories which will enable a thorough cleaning job to be carried out. For example, different brushes and lances suitable for cleaning particular areas.
• Is a vacuum facility required to remove residue?
• Is the machine easily portable?
• What steam pressure is required
• Is a detergent delivery system required
• The surface to be cleaned and sanitised

Using a dry steam cleaner will drastically reduce the need for detergents used in other cleaning methods. It is anticipated that detergent use would be reduced within a range of 80 to 90% and the use of water by up to 95%. Using a dry steam cleaner gives not only environmental advantages but also economic ones as well.
There are many factors to consider before buying or hiring a steam cleaner and before entering into a contract, be sure that the machine will do what you expect it to. If in doubt get expert advice and you can always hire for a period before buying to make sure it does what you want it to. See some examples.

Natural Floors - How to Clean Stone - Scrubber Dryer

Cleaning a stone floor may seem a simple task but stone, being a natural material, has to be treated carefully and because there are so many different types of stone flooring each has to be treated in its own particular way.

Stone varies in durability and texture, for instance marble is dense and hard wearing whereas sandstone for example is also hard wearing but also less dense than marble making it susceptible to staining. The best way to keep a stone floor looking good is regular cleaning to prevent the build-up of deposits and stains which can accumulate over time. In a commercial environment efficient cleaning is important as it limits the time that the cleaning operation potentially interferes with the working day.

There are cleaning machines available for cleaning stone floors which are considerably quicker than a mop and bucket, and more health and safety friendly! For general cleaning of large stone floors a scrubber dryer would fit the bill as its rotating brushes together with a proprietary chemical solution suitable for the type of stone floor being cleaned, ensures effective cleaning. A more adaptable machine is the rotary floor cleaning machine also known as a single disc machine. This type of stone floor cleaning machine allows for the cleaning brush or pad to be changed easily to suit the cleaning purpose. For instance when cleaning marble floors a diamond finisher pad can be attached which grinds out the imperfections of the stone to return it to its original condition. There are various attachments for cleaning, buffing and polishing which means one machine can carry out a variety of cleaning actions. Once the floor has been cleaned it should be sealed with a good quality sealant to protect the surface and make any spillages or stains easier to remove.

So there is complexity in cleaning stone floors as there are so many variables. The type of stone, the degree of staining, even the accessibility to carry out the cleaning operation, all play their part is deciding how to go about it. The best way to decide how to clean a stone floor is to get advice at the outset about the type of cleaning machine and cleaning products that will be needed to get the job done.

In spite of all the advances being made in the category, there’s still independent testing and the human factor to consider. According to Rathey, managers in the market for a new backpack vacuum should consider one that is approved by the Carpet and Rug Institute. From there, the machine is only as good as the human factor it takes to maintain and operate.

“When you add the human factor as part of the machine, procedures need to center around maintenance and training,” says Rathey. “While current models are more ergonomic, employee training is the basis for the best results to help prevent injuries.”

When putting together a maintenance plan for backpack vacuums, first check with the equipment manufacturer. In addition to what’s outlined by manufacturers, staff should be checking filters and cords on a regular basis.

“Filters should be emptied after every two hours of usage and micro filters should be discarded every week and replaced with new ones,” says Walker. “Cloth and exhaust filters should be rinsed out on a weekly basis and replaced when they’re worn. This helps prolong the life of the vacuum.”

It is also important for staff to wind cords properly as they move through the building.

“If this doesn’t happen, in a very short period of time, the cords will end up looking like a 50-foot long ramen noodle,” adds Walker. “Once this happens, cord breakage and torn sheathing is next.”

When checking the cords, train staff to also examine the power plug prongs.

“I see broken prongs in almost every cleaning operation I visit,” says Walker. “Cleaning workers must know that broken prongs need to be reported and extension cords need to be replaced.”

With proper care, this equipment can remain a long-lasting staple for custodial departments. Managers looking to increase cleaning efficiency and productivity of their staff should add ongoing training and maintenance procedures as equipment is introduced. They should also keep on top of equipment advancements that can streamline existing carpet care programs. - See more at: http://www.cleanlink.com/hs/article/Proper-Maintenance-Of-Backpack-Vacuums--17403#sthash.ZOPaPQgu.dpuf

In spite of all the advances being made in the category, there’s still independent testing and the human factor to consider. According to Rathey, managers in the market for a new backpack vacuum should consider one that is approved by the Carpet and Rug Institute. From there, the machine is only as good as the human factor it takes to maintain and operate.

“When you add the human factor as part of the machine, procedures need to center around maintenance and training,” says Rathey. “While current models are more ergonomic, employee training is the basis for the best results to help prevent injuries.”

When putting together a maintenance plan for backpack vacuums, first check with the equipment manufacturer. In addition to what’s outlined by manufacturers, staff should be checking filters and cords on a regular basis.

“Filters should be emptied after every two hours of usage and micro filters should be discarded every week and replaced with new ones,” says Walker. “Cloth and exhaust filters should be rinsed out on a weekly basis and replaced when they’re worn. This helps prolong the life of the vacuum.”

It is also important for staff to wind cords properly as they move through the building.

“If this doesn’t happen, in a very short period of time, the cords will end up looking like a 50-foot long ramen noodle,” adds Walker. “Once this happens, cord breakage and torn sheathing is next.”

When checking the cords, train staff to also examine the power plug prongs.

“I see broken prongs in almost every cleaning operation I visit,” says Walker. “Cleaning workers must know that broken prongs need to be reported and extension cords need to be replaced.”

With proper care, this equipment can remain a long-lasting staple for custodial departments. Managers looking to increase cleaning efficiency and productivity of their staff should add ongoing training and maintenance procedures as equipment is introduced. They should also keep on top of equipment advancements that can streamline existing carpet care programs. - See more at: http://www.cleanlink.com/hs/article/Proper-Maintenance-Of-Backpack-Vacuums--17403#sthash.ZOPaPQgu.dpuf

In spite of all the advances being made in the category, there’s still independent testing and the human factor to consider. According to Rathey, managers in the market for a new backpack vacuum should consider one that is approved by the Carpet and Rug Institute. From there, the machine is only as good as the human factor it takes to maintain and operate.

“When you add the human factor as part of the machine, procedures need to center around maintenance and training,” says Rathey. “While current models are more ergonomic, employee training is the basis for the best results to help prevent injuries.”

When putting together a maintenance plan for backpack vacuums, first check with the equipment manufacturer. In addition to what’s outlined by manufacturers, staff should be checking filters and cords on a regular basis.

“Filters should be emptied after every two hours of usage and micro filters should be discarded every week and replaced with new ones,” says Walker. “Cloth and exhaust filters should be rinsed out on a weekly basis and replaced when they’re worn. This helps prolong the life of the vacuum.”

It is also important for staff to wind cords properly as they move through the building.

“If this doesn’t happen, in a very short period of time, the cords will end up looking like a 50-foot long ramen noodle,” adds Walker. “Once this happens, cord breakage and torn sheathing is next.”

When checking the cords, train staff to also examine the power plug prongs.

“I see broken prongs in almost every cleaning operation I visit,” says Walker. “Cleaning workers must know that broken prongs need to be reported and extension cords need to be replaced.”

With proper care, this equipment can remain a long-lasting staple for custodial departments. Managers looking to increase cleaning efficiency and productivity of their staff should add ongoing training and maintenance procedures as equipment is introduced. They should also keep on top of equipment advancements that can streamline existing carpet care programs. - See more at: http://www.cleanlink.com/hs/article/Proper-Maintenance-Of-Backpack-Vacuums--17403#sthash.ZOPaPQgu.dpuf

Spring Cleaning

The term “spring cleaning” can be daunting. Remembering all the little items and spaces that need attention can be difficult. Use this outline to help you quickly get through the cleaning tasks you might otherwise avoid during the rest of the year.

Wipe Down the Cabinets and Drawers
Depending on what your cabinets are made of, choose a cleaner that will not damage the surface. (A multi-surface cleaner will likely work on all cabinet surfaces, but check with the manufacturer first, or test the cleaner first in an inconspicuous area.) With a cotton cloth or paper towel, wipe down the fronts and edges of all of your cabinets and drawers to remove the grime and food buildup from dirty fingers and cooking. Then, wipe down all the handles of your cabinets and drawers with a disinfectant cleaner.

Wipe Down Backsplashes
Hopefully your counters are cleaned on a daily basis in the kitchen, but people often neglect cleaning the backsplashes behind counters, which can be susceptible to splashes from mixing bowls and pots and pans on the stove top. Wipe the walls behind the counters with a cloth rag, paper towel or sponge and multipurpose cleaner to remove cooking grime and dirt.

Clean Out the Refrigerator
Use a disinfectant cleaner and and cloth rags or paper towels to wipe out the fridge from back to front. If your fridge shelves and produce bins are removable, take them out and clean them in the sink with dish soap. Make sure you wipe down the inside of the door and the walls, as well as the front of the fridge. Use disinfectant cleaner on the handle.

Clean Appliances
This may include the toaster, microwave, coffee maker, blender or anything else that sits on your counter and is subject to daily use. Wipe evertything down with a cloth and multipurpose or disinfecting cleaning product. Remove the crumb tray from the toaster and empty that, run a pot of white vinegar through your coffee maker to clean the inside out and remove stains, and wipe down the inside of your microwave.

Clean the Oven
If your oven doesn't have a self-cleaning setting (or you just hate the smell of it) use this cleaning technique to remove grease, spills and buildup. Mix 5 tablespoons of baking soda, 5 drops of dish soap and 4 tablespoons of vinegar into a paste and use a sponge to cover the inside of the oven with it. Close the oven door and let it sit for 15 minutes. Then, cover half of a lemon with salt and dish soap, and use that to scrub (and scrub!) the paste into the oven. When all the buildup is disintegrated, wipe away the cleaning solution with a damp cloth or paper towels.

Clean the Dishwasher
Freshen up the dishwasher and remove buildup by placing a glass cup full of vinegar in the top rack and running it through a cycle with the hottest water possible. (Make sure there is nothing else in the dishwasher besides the cup of vinegar.) After the cycle is done, sprinkle a a cup of baking soda around the basin and run it through another cycle with the hottest water possible. This combination of baking soda and vinegar will remove stains and soap buildup.

Sweep and Mop
Sweep and mop the kitchen floor, taking care to get into the corners and underneath cabinet edges that may be neglected during regular cleanings. Pull out the fridge and clean the flooring area where it sets. Yes, this will be a pain, but the combination of collected dust and moisture from the fridge can actually damage your flooring, not to mention cause your refrigerator to run inefficiently.

Bathroom

Clean Around the Base of the Toilet
Wipe down the base of the toilet (where it meets the floor) with a sponge or cloth and disinfectant cleaner. Pay close attention to the sides, front, and area behind the toilet, which can get dusty and are often ignored during routine cleanings.

Wipe Down the Inside of Cabinets
Take all products out of the medicine cabinet, drawers and other storage spaces. Wipe down the surfaces with a damp sponge or cotton cloth and multipurpose cleaner. Put all items back neatly when the areas are dry. Also take this time to toss any expired products and reorganize your space with what's left over.

Living Room

Deep Floor Cleaning
Pull all the furniture that sits on the floor away from the walls. This includes couches, coffee tables and any other furniture you can move. Sweep or vacuum underneath, or mop if you have tile. Put everything back and mop or vacuum one more time. You may want to rent a steamer from a grocery or hardware store to deep clean any carpeted areas.
 
Dust
Use a cotton cloth and a multi-surface spray to wipe down everything in your living room including electronics, knick-knacks, movies, books and shelves. Dust collects over time, especially in corners -- it’s time to get rid of it. Also remember to dust light fixtures, including ceiling fans. Dust collects easily on fan blades, especially over winter when you're less likely to turn the fan on. Dusting them will prevent the dirt from flinging into the air when you do start using it again.

Furniture
Give your couch and arm chairs a good vacuum with the upholstery attachment, removing the cushions to clean underneath them. Spot treat any stains the best you can, taking into account the material of your couch.

Clean Window Treatments
If you have curtains, wash them according to the manufacturer instructions on the tag and hang them when dry to prevent wrinkling.
To clean blinds, fill a bowl with hot water and 1 teaspoon of dish soap. Wipe each blind individually with a microfiber cloth that has been dipped into the cleaning solution. Always wipe blinds with a clean section of cloth so to not leave streaks.

Bedroom

Vacuum or Sweep
Sweep or vacuum as with the living room, moving furniture to clean underneath.

Dust
Wipe down all dressers, nightstands and knick-knacks with a multi-surface spray and cloth.

Clean Your Bed
Remove your mattress, bed skirt and box spring from your bed frame to wipe the frame down with a damp cloth. Also wipe down the wall and floor boards behind your bed. After removing the bedding from the mattress, make a solution of 1 cup baking soda and 4 drops essential oil, such as lavender. Use a kitchen strainer to sprinkle this mixture over the surface of the mattress. Let it sit for an hour and then vacuum up with the upholstery attachment. The baking soda will draw up dirt and deodorize while the essential oil leaves behind a fresh scent.

Miscellaneous Areas

Baseboards
In all rooms and entryways, wipe baseboards with a cotton cloth that has been dipped into a multi-surface cleaner. Pay close attention to corners and high traffic areas that can be easily missed.

Windows
If you don't want to hire a professional window cleaner, this is a task you can accomplish yourself, at least for first story windows. If possible, remove the window pane and screen from the track and hose them down in the yard with a high powered spray. For a thorough cleaning, use dish soap and a sponge, rag or bristle brush for the screen. Let the screen and windows dry thoroughly in the yard before you insert them back into the window track. In the meantime, vacuum the frame out with an attachment and wipe out any visible dirt or grime from the track so the window can slide smoothly.
For windows that aren't removable, a solution of water and white vinegar works as an effective cleaner combined with a clean cloth to wipe it down.

Vents
Take all your vent covers outside and spray them off with the hose on high power. Let them air dry outside before putting them back in the house.

Pressure Washers - Cleaning Machines

Pressure washers are a vital tool in the industrial environment ensuring that cleaning is carried out to the standards and regulations required. The pressure washer has been around for many years and has developed into a wide range of types. The basic principle is the same in that water is fed into a machine and is the pumped out via a lance, exiting through an adjustable nozzle. The spray can be altered by adjusting the nozzle to suit the cleaning job in hand, the narrower the water jet the stronger the cleaning force, but less area is covered.

Selecting a Pressure Washer

Selecting the correctly sized machine from the huge range of pressure washers available can be daunting. The selection criteria are based on the type of job the appliance is required for. An example would be oil or greasy deposits which are adherent may require a high pressure to remove them, however a large hard surface area requires a lower pressure but a higher water volume. Consideration should always be given to the duty that the machine will be required to give to make sure you select the correct machine.

Types of Pressure Washers

The sophistication of pressure washers has developed over the years and there is a lot of choice. Hot water washers as well as cold are now available which are more effective if degreasing or disinfecting are required. The other advantage is that because hot water cleans better than cold, lower pressures can be used. Pressure washers can be portable or static and there are advantages to both:

• Portable Pressure Washers have an advantage as they can be moved where the cleaning is required. If the washer powered by electricity the portability is obviously restricted by the length of the power cord. Some pressure washers are available with their own power source, such as a diesel engine and can be moved around the site or off site for remote cleaning.
• Static Pressure Washers are a static wash system for premises where there is a regular requirement for hot water pressure cleaning. This would useful say in a transport company where a static jet wash facility could be used by a variety of operators at different times or in a small food processing plant where a cabinet mounted pressure washer would enable efficient cleaning. This type of stand alone hot pressure washer can be attached to a ring main system for one or two operators to access at various points to clean around the premises.

For information about pressure washers and how they can help you keep your business spotless, contact Astol Cleantech (P) Limited for the best advice and prices available.

Cleaning Equipment - Vacuum Cleaners

The range of cleaning equipment available for cleaning the industrial environment is large and varied. There is equipment to assist in all areas and can achieve levels of cleanliness and hygiene in a remarkably short space of time, resulting in less downtime and a more efficient use of resources

Types of Cleaning Equipment - Floor

Floor cleaning is a job that has to be done in all environments large and small, and there is a machine for every task. For instance the vacuum cleaner can do more than clean carpets, being available in models that can remove wet or dry residue, or even deal with hazardous dust. The floor sweeper is quite a familiar sight in commercial premises, and mechanically replicates the action of manual sweeping. The dirt is swept back under the machine by the leading rotating brush and swept further by a horizontal brush, back into a collection vessel. There are a variety of configurations and sizes to suit all applications, and to achieve the optimum results. For more adherent deposits there is the scrubber dryer, which is similar in appearance to the floor sweeper but fulfils a different function. This machine also uses a leading rotating brush but also applies a detergent solution and literally scrubs the floor. The resultant residue is then removed by a system of squeegees to leave the floor dry. Both sweepers and scrubber dryers can be pedestrian operated or ride-on depending on size. Basically there is a floor machine for every type of surface and every type of deposit.

Other Types of Cleaning Equipment

Industrial processes are by their nature prone to create dirt and pollution within the workplace and outside; sometimes the dirt and pollution is created by the public (for instance graffiti); but it all requires an efficient clean up. The development of the pressure washer over the last 40 years has improved the ability to remove stubborn dirt and to do it in a shorter time (it is particularly useful in the field of graffiti removal). Pressure washers may use hot or cold water; cold for general grime but for stubborn stains or degreasing then hot water is better. The amount of pressure used to impel the water is important as too high a pressure could damage the surface being cleaned, yet too low would render the washer less effective. A pressure washer can be portable or static. The portable washer has the advantage of being able to be moved around or even off site, however, if the cleaning is part of a regular process, a static cabinet mounted pressure washer could be better as it is always in position ready to go and geared to the job in hand. For instance a pressure washer could be used as a static jet wash in the transport industry or as part of a centralised cleaning system where a number of operatives can use the pressure washer at the same time by using a ring main system.

For more specific and hygienic cleaning, then a steam cleaner may be the answer which as with the pressure washers these can be portable or static.

To find the right solution to your cleaning problem talk to people who know, like Astol Cleantech (P) Limited who have a wealth of experience in the cleaning equipment industry and have great advice and products at good prices.

Industrial Sweeper

The need for sweeping the floor in the industrial and commercial environment is a significant requirement of any cleaning regime. The industrial sweeper has evolved over time to be a significant tool in the fight against dirt in the workplace

Industrial Sweeper – How Does it Work?

The operation of an industrial sweeper is basically quite simple and consists of one or two disc brushes which rotate and sweep the dirt back into the machine. The dirt is swept by a cylindrical brush, back into a collection tank for subsequent disposal. On the face of it quite straightforward, but there are many factors to consider when operating or purchasing a machine

Industrial Sweeper – Salient Points

• Brush Type – depends on the type of dirt being collected. For instance, to collect heavy deposits a stiffer, rougher brush should be used whereas for lighter dirt or dust then a thinner more flexible brush should be used.
• Type – Does the machine need to be a ride-on or walk behind (pedestrian) version. This is dependent on the size of area being cleaned and the access to it.
• Power – If it is engine powered consideration must be given if it is to be used inside to ventilation with regard to exhaust fumes. If it is battery powered then the charge life and type should be considered.
• Ease of Use – It should be easy to use by a variety of operators and ergonomically designed to reduce fatigue.
• Adjustable- Things like the brushes should be adjustable to ensure good contact with the floor. Some machines has a self levelling system to maintain good contact on a variety of floor surfaces.
• Design – It should be robust as it is being used in an industrial environment. Consideration should be given to access for maintenance and cleaning.

There are many other things to consider such as filtration, programmable controls and auto stop safety features. There is undoubtedly much to think about before purchasing an industrial sweeper. To make the right purchase it is best to talk to the experts in cleaning equipment at Astol Cleantech (P) Limited, who have the knowledge and products to ensure you get best machine at the best price.

What is a pressure washer? - Vacuum Cleaner

A pressure washer is a mechanical device that uses a pump to generate a high-pressure stream of water to clean surfaces. The pump is typically powered by a gasoline engine, an electric motor, or a diesel engine. The pump is a positive displacement pump that forces a specific amount of water flow from the outlet.  By restricting the flow with the nozzle, much like you do by placing your thumb over the end of a garden hose, the pressure washer produces pressure. Without the nozzle the impact of the water from the end of the pressure washer hose is similar to that from a garden hose. The narrow diameter of the nozzle increases the water's velocity and, consequently, its impact and cleaning power. The smaller the nozzle orifice, the more pressure is potentially produced. However to produce greater pressure, more horsepower is required to force the water through the smaller hole. Each pressure washer calls for a specific size nozzle to match the flow of the pump and the horsepower of the motor. Putting too small a nozzle on your pressure washer strains the components and may cause excessive wear to the machine; too large a nozzle sacrifices cleaning power.

All pressure washers produce pressure and flow. Both are important to the cleaning process. Most pressure washers also provide a method for dispensing soap or detergents, either under low or high pressure. The proper use of soap is often key to the cleaning process. Hot water pressure washer are equipped a burner system to continuously heat the stream of water, further aiding the aiding the cleaning process. Most hot water pressure washer can generate wet steam of approximately 240 degrees F, by turning down the pressure to around 150 PSI. There also true steam cleaners that generate a dry steam of approximately 320 degrees F at 150 PSI. Understanding the basic concepts of pressure flow and cleaning units will help you pick the right pressure washer for the cleaning job at hand.

Pressure and flow
Pressure washers use the impact of the water to break the bond of the dirt to the surface you are trying to clean; the higher the pressure, the greater the impact. The type of nozzle you use makes a huge difference in how much impact your pressure washer creates. A zero degree tip gives you the full impact of your pressure washer but is almost useless for cleaning because it hits such a small area. A 15 degree nozzle increases the area you can clean at one time, but reduces impact by 70%. A 40 degree increases the surface area cleaned further, but has 88% less impact than a zero degree nozzle. This is why a turbo nozzle is so effective; for it is a 0 degree nozzle rotating thousands of times a minute creating a 25 degree cone of full impact.
The amount of water, or flow, a pressure washer puts out makes a big difference in cleaning. The flow is what carries the impact to the surface. The more flow, the more impact; there is a direct relationship. A 13 HP pressure washer putting out 4000 PSI at 3.5 gallons a minutes flow has one third less impact than a 20 HP unit putting out 3,500 PSI at 5.0 gallons per minute. Moreover, flow is what is needed for effective rinsing. This is especially true when cleaning large open surfaces, like driveways; or quickly rinsing vehicles in truck washing operation.

Cleaning units
A pressure washer pump creates a positive water flow, and by restricting that flow at the nozzle creates pressure. The more horse power driving the pump allows more flow to be pushed through the pump and the more pressure to be created at the nozzle. For a given amount of horsepower you can have only so much pressure and flow; there is a tradeoff. Most people focus on pressure (PSI), but you really need to consider both pressure and flow. One way of comparing pressure washers is to use the measure of “cleaning units”. To calculate cleaning units, multiply the pressure times the flow of the pressure washer. All other things being equal (i.e. chemical use and heat) a unit with higher cleaning units will clean better than a unit with lower cleaning units.

Cleaning unit application guidelines
Home use, light duty: 2,000 to 3,750 cleaning units.
Medium duty: 3,800 to 7,500 cleaning units
Heavy duty: 7,600 to 15,000 cleaning units'

The measure of cleaning units is a good way to compare the power of one pressure washer relative to another, with the following proviso. When two pressure washers have different pressure and flow specifications, but the cleaning units are equal, remember the unit with the higher pressure unit will make a rotary nozzle work better, while the higher flow unit will rinse better and make flat tip nozzles work more effectively. With that in mind, the following guide can be used on how much pressure and flow is needed to perform certain tasks. Some of these tasks may require a rotary Dirt Killer nozzle as well if you are using the minimum PSI. The minimum specifications are what are required to get the job done. Having more pressure and flow will make the job go faster. The column marked preferred CU shows how much cleaning power is required to get the job done more quickly. (CU means Cleaning Units: cleaning units = Pounds per Square Inch of pressure (PSI) times Gallons Per Minute of flow (GPM).