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You should avoid using a pressure washer on any surface or item that could be damaged by the high-pressure spray, as some materials are too delicate to withstand the force.

Key items and surfaces to avoid include:

• Electrical Components: Never pressure wash electrical systems, as water can cause short-circuits and create a safety hazard. This includes utility meters, breaker boxes, electrical outlets, generators, and HVAC or air conditioner units.

• Delicate and Fragile Materials: Fragile items can crack, shatter, or be stripped by the pressure. Avoid pressure washing windows, glass, light fixtures, shingled roofs (especially asphalt), and stucco.

• Painted, Stained, or Sealed Surfaces: Unless your goal is to strip the finish, do not pressure wash painted surfaces, stained wood (like decks), or anything with a protective seal that could be stripped away. Be especially cautious with older surfaces that may contain lead paint.

• Soft Woods and Certain Decking: Delicate surfaces like softwood, composite decking, and antique or wooden patio furniture can be etched or damaged. If you must wash wood, use a lower-powered pressure washer with a wide-angle nozzle to prevent damage.

• Living Things: Never use a pressure washer on people, pets, or plants. The force can cause serious injury and will destroy landscaping.

You should always hook up your pressure washer to the water supply before turning it on and ensure there’s a good water flow. If you try to turn the machine on without water in the system, it overworks and overheats the unlubricated pump. This can quickly lead to irreversible damage.

Costs depend on surface material, level of grime, accessibility, labor, and required cleaning agents.

Yes, a pressure washer uses less water than a garden hose. There are many ways to use a pressure washer, and it can be an eco-friendly hose substitute. While a pressure washer expels water with greater force, it uses 50% to 70% less water than a garden hose. Specifically, hoses put out six to 10 gallons per minute (GPM), while pressure washers only use two to five GPM.