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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. Machines that produce pressures from 750 to 30,000 psi (5 to 200 MPa) or more are available.The terms pressure washing and power washing are used interchangeably in many scenarios, and there is some debate as to whether they are actually different processes.A pressure washing surface cleaner is a tool consisting of two to four high-pressure jets on a rotating bar that swivels when water is flowing. This action creates a uniformed cleaning pattern that can clean flat surfaces at a rapid rate.Hydro-jet cleaning is a more powerful form of power washing, employed to remove buildup and debris in tanks and lines.A car wash, carwash,or auto wash is a facility used to clean the exterior,and in some cases the interior of motor vehicles. Car washes can be self-service, full-service (with attendants who wash the vehicle), or fully automated (possibly connected to a gas station).Car washes may also be events where people pay to have their cars washed by volunteers, often using less specialized equipment, as a method to raise money for some purpose.