Curious about what actually happens during a professional pressure wash? Here's a clear explanation of the process and the equipment involved.
Pressure washing uses high-pressure water to remove dirt, moss, algae, and grime from hard surfaces. A petrol or electric pump forces water through a narrow nozzle at very high velocity — typically between 1,500 and 4,000 PSI (pounds per square inch) for professional equipment. This concentrated force strips away biological growth and ingrained dirt that cannot be removed by scrubbing or normal hosing.
Professional technicians adjust the pressure and nozzle type to suit the surface being cleaned. A narrow, high-pressure nozzle delivers the most cutting power but can damage softer surfaces. A wider-angle nozzle spreads the water over a larger area at lower intensity, better suited to surfaces like Indian sandstone or wooden decking. Getting this judgement right is what separates professionals from DIY results.
For large flat areas like driveways and patios, professionals use a rotary surface cleaner — a disc attachment that spins two water jets across the surface in a uniform pattern. This delivers a perfectly even clean without the streaking that can result from hand-held lance work. After cleaning, a final rinse removes loosened debris from the surface and joints.
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