What is the meaning of pressure washing?

What is the meaning of pressure washing?

Pressure washing is the process of using a mechanical pump to force water through a narrow nozzle at high pressure — typically far beyond what a garden hose can produce — to remove dirt, mold, algae, loose paint, and other buildup from outdoor surfaces. The pump can be powered by electricity or a gas engine, and pressure is measured in PSI (pounds per square inch), while water volume is measured in GPM (gallons per minute). Together, PSI and GPM determine how fast and how thoroughly a surface gets cleaned. Pressure washing differs from simple hosing down a surface because the concentrated force actually lifts embedded grime rather than just rinsing the top layer, which is why it’s the standard method for driveways, siding, decks, and fences.