Pressure washing or power washing is the use of high-pressure water spray to remove loose paint, mold, grime, dust, mud, and dirt from surfaces and objects such as buildings, vehicles and concrete surfaces. The volume of a mechanical pressure washer is expressed in gallons or liters per minute, often designed into the pump and not variable. The pressure, expressed in pounds per square inch, pascals, or bar, is designed into the pump but can be varied by adjusting the unloader valve or using specialized nozzle tips. Machines that produce pressures from 750 to 30,000 psi or more are available.

Alfred Kärcher SE & Co. KG is a German family-owned company that operates worldwide and is known for its high-pressure cleaners, floor care equipment, parts cleaning systems, wash water treatment, military decontamination equipment and window vacuum cleaners.