SWP: High-Pressure Cleaners

Our High-Pressure Cleaners work at pressure of up to 30,000 psi (300 bar) through a very tiny vent in a lance. We have a rotating nozzle as well as an ordinary jet spray option. As a result, this equipment can be a hazard when used incorrectly or at very close range. Safety goggles, water repellent clothing and safety shoes are to be worn at all times.

Long-sleeved shirts, long pants, and gloves will help protect against accidentally injecting paint under your skin, should you unintentionally hit the trigger while the nozzle is near you.

Care needs to be taken when working around wood siding, windows, sliding doors or other glass.

Do’s and Don’ts When High-Pressure Cleaning

  • DO wear proper eye and hand protection when operating the equipment.
  • DO attach nozzles and/or accessories before turning on the water.
  • DO keep hands and feet clear of the cleaning nozzle at all times.
  • DO let the machine run for several minutes before starting to power-wash.
  • DO consider using a special cleaning agent if the surface shows heavy mildew growth.
  • DO follow the equipment manufacturer’s directions with respect to distance between the spray head and the surface — typically 15-25cm, although this varies with the p.s.i and spray width settings. (Moving too close may harm the surface; staying too far away may be ineffective.)
  • DO work from the top of the wall to the bottom, rather than vice versa. Otherwise, dirt and mildew will run down over the already-cleaned section.
  • DO direct the water at a downward arc when cleaning wood substrates. Spraying wood head-on can damage the siding.
  • DO power-wash the surface thoroughly. Paint adheres best to surfaces that are totally clean.
  • DO turn off water at the source to release pressure BEFORE disconnecting hoses.
  • DO set the safety lock when the equipment is not in use.


  • DON’T fill the fuel tank while the engine is running.
  • DON’T leave the nozzle in a closed position for more than a minute or two while the equipment is running. The pump may overheat.
  • DON’T try to repair a leak in the hose or connection while the system is under pressure.
  • DON’T aim the power-washer at an upward angle when cleaning lap siding. This can drive water behind the siding. Also, the force of the water can lift the siding from the wall.
  • DON’T spray stucco, brick or masonry walls straight on. The force of the spray can cause water to penetrate cracks in the walls and cause damage within.
  • DON’T aim the spray at windows or glass doors. The force is strong enough to shatter them.