Got this in an email from pressure washing news Low-Pressure Washing
Can we clean without pressure? As the before and after pictures above show - YES! As a matter of fact, the shed in the photos was washed using just a garden hose and sprayer.
Promoting your pressure washing business as a "low-pressure" company resonates with customers that are concerned about damage to their structure from the use of thousands of pounds of pressure. Some have already either had a company - or themselves - do damage.
While pressure has it's place, equipping your rig with a downstream injector and proper tips, or an xJet, will allow you to wash without damage. The nozzle chart is an invaluable tool in determining the pressure you are working with. (Thanks to Steve Rowlett for creating the above chart many years ago.)