Pressure Washing Tips, Tricks, and Techniques

Pressure Washer
  • Before pressure washing make sure to always fog or presoak the surface with a detergent, degreaser, or chemical presoak. Presoaking reduces wash time and chemical cost.
  • Hot water is a better solvent than cold water.
  • Always rinse detergent off the surface before it dries.
  • Commercial contractors generally use 4 to 6/gpm at 1500 to 3,500/psi for most cleaningapplications. An exception to this is wood cleaning. Here 500 to 2,000/psi is preferred with chemical cleaning to reduce the furring of the wood. Water flow rates of less than 4 gallons per minute – found on general consumer (homeowner) units – are not high enough to be competitive because of increased cleaning time, which raises labor costs.
  • Chemical dilution is largely a matter of personal preference. For most mobile power washing work, chemical costs run from three to five percent of gross sales, labor accounts for 30 to 45 percent, and fuel for heat is two to four percent. If chemicals and heat costs are reduced, labor costs increase because of increased work time. A slight increase in chemical and fuel costs actually reduces labor costs, because work time decreases.  Work smarter – soap and heat are cheaper than labor – not harder.
  • Washers with chemical injection before the pump, start out with the metering valve open 1/4 turn. Then adjust as needed.
  • W-200 Spray Wax is similar to spray wax used in coin-operated car washes. Apply the wax hot and follow with a cold rinse for fine surfaces like cars and pickups. On heavier surfaces, like homes and trailers, the cold rinse is not necessary. The application of wax extends the life of the wash job, makes subsequent cleaning easier, and enhances the overall appearance. Note: Because the application of wax will extend the life of a wash job, some contractors choose not to use it because they prefer to wash more often. Thereare two sides to this. While the use of wax may reduce your income because of the extended life of your cleaning, the enhanced appearance and extended life may generate more business because of the perceived quality of the work.
  • For fleet washing, wax in the rinse water reduces dirt adhesion and lessens subsequent washing time. In heavy concentrations, wax reduces cement adhesion on concrete trucks.
  • The tips provided in this section will reduce brushing to about five percent of the total workload. Typically, contractors only brush in the spring or the fall, or as needed.
  • Brushing once or twice per year at a specified time allows the contractor to prepare and schedule extra, short-term, help for those designated times.
  • For Environmental Power Washing Techniques read Report 507.


Service Question(s) of the Day!?

Pressure Washing
Pressure Washing

Why does your work stand out from others who do what you do?

We go beyond to give 110% when it comes to quality customer service and fully satisfying our customers.


What questions do customers most commonly ask you? What’s your answer?

Our customers usually ask us, “Does your company sell and service pressure washers?” and our answer is always “Yes, we sell and service all forms of industrial equipment”.

Pressure Washer Nozzle Usage


0º – red nozzle: Narrow and powerful stream of water. Used for very difficult to remove stains, caked mud, tough dirt.
15º – yellow nozzle: Uses a small angle of spray for focused cleaning. Good for somewhat difficult to remove dirt.
25º – green nozzle: Uses a medium angle of spray for washing sensitive and soft surfaces (deck, fence, aluminum etc.)
40º – white nozzle: Largest angle of spray used for cleaning surfaces quickly and for rinsing.
65º – soap (black) nozzle: Soap tip is used in conjunction with the cleaning fluid. This is the only nozzle that can be used with cleaning solutions.

How do I clean clogged nozzles in pressure washers?


1. Always disconnect your spray wand from the gun before cleaning your nozzles!
2. Clear the nozzle with a small rigid piece of wire such as a paper clip.
3. Flush the nozzle backwards with water.
4. Reconnect the wand to the gun
5. Restart the pressure washer and depress the trigger on the spray gun.
If the nozzle is still plugged or partially plugged, repeat number 1-4.

If the previous procedure does not clear the nozzle, replace with a new nozzle.

What is Power Washing?


Power washing, or pressure washing, is the growing application of high pressure water spray. Produced by specially designed pumps, this spray is a hundred times more powerful than the typical garden hose. On concrete it is used to remove unsightly mold, bubble gum, and other dirt stains. Wooden decks are returned to the look of new wood, void of graying and fatigued finishes. And on houses, the appearance of siding (namely aluminum and vinyl) is greatly improved by removing pollution, mildew, and other signs of neglect.