Pressure washing or power washing is the use of spraying water under high pressure to remove loose paint, mold, algae, grime, dust, mud, chewing gum and dirt from surfaces and objects like buildings, fences, masonry, some vehicles and concrete or asphalt surfaces such as driveways or patios. The terms “power washing” and “pressure washing” are often used interchangeably, but the fact is they’re two different processes. Both use water under high pressure to clean surfaces, but power washing has a heating element to heat the water and pressure washing does not.