The Quick Answer

At its core, pressure washing utilizes a motorized pump to accelerate water through a narrow nozzle, creating a high-velocity stream. This stream is capable of breaking the chemical bonds of dirt, algae, and chewing gum, separating them entirely from hard surfaces like concrete or steel.

How Pressure Washing Equipment Works

Standard municipal water supply enters the pressure washer where it is put under extreme pressure (often between 1,500 to 4,000 PSI) by a gas or electric-powered pump. This highly pressurized water is then forced through a restrictive nozzle. Depending on the degree of the nozzle (typically 0°, 15°, 25°, or 40°), the water slice can either act like a sharp chisel or a wide broom.

Best Surfaces for High-Pressure Cleaning

High pressure is incredibly powerful, which means it can be incredibly destructive. The best surfaces for high-pressure washing include:

  • Driveways and poured concrete
  • Brick and masonry (with caution regarding mortar)
  • Exposed aggregate
  • Heavy-duty commercial dumpster pads

When to Call a Professional vs. DIY

While home improvement stores sell pressure washers, doing it yourself often leads to "zebra striping" (uneven cleaning lines), blown-out window seals, or etched concrete. Professional companies utilize specialized surface cleaner attachments, hot water units, and the exact chemical pre-treatments necessary to dissolve grime—meaning we don't have to rely purely on destructive water pressure.

Need concrete cleaned safely?

Check out our professional Driveway Cleaning services to see how we do it without risking damage to your concrete.