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One of the most important factors to consider when buying a pressure washer is not just psi but also the machine’s overall cleaning power. This is based on both the psi and the GPM. Look for a cleaning rating, or effective cleaning unit (ECU), of up to 8,000 for most residential cleaning projects that require a pressure washer.

Powerwashing services for businesses typically range from $200 to $1,500, depending on surface size, level of grime, and cleaning methods. Heavily stained or high-rise buildings may require additional labor and equipment.

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.

Deciding whether to buy or rent a pressure washer depends on your budget and how often you plan to use it.

• Renting: The daily rental cost typically ranges from $40 to $175. Renting can be more cost-effective for a one-time project.

• Buying: The purchase price for a pressure washer can range from $100 to over $1,000. More specifically, electric models generally cost between $100 and $400, while gas models run from $300 to $600.

If you anticipate using a pressure washer multiple times a year, buying one is often a better long-term investment. When purchasing, remember that a higher-quality machine will likely deliver better and more reliable results.