The Basics of Pressure Washing from easy do-it-yourself jobs to heavy duty commercial and industrial projects:
A Simple Pressure Washer
Home-use pressure washer powered by a small gasoline engine
A pressure washer is a high pressure mechanical sprayer that can be used to remove loose paint, mold, grime, dust, mud, and dirt from surfaces and objects such as buildings, vehicles, concrete surfaces, etc. The volume of a pressure washer is expressed in either gallons or litres per minute, often designed into the pump and not variable. A pump’s pressure, expressed in pounds per square inch, pascals, or bar (deprecated but in common usage), is also designed into the pump but can be varied by adjusting the unloader valve. Machines that produce pressures from 750 to 30,000 psi (5 to 200 MPa) or more are available.