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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.

If your concrete stains are green in color, it indicates the presence of mold or algae—which you should address right away. If left unattended, mold will spread to other areas throughout the home. However, be careful not to disturb mold on indoor concrete surfaces and work with a local mold remediation specialist for specialized care. Once free from mold and algae, seal your concrete to eliminate pores and gaps.

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.

Combining power and soft washing is a great way to ensure that all surfaces, both fragile and not, get the attention they deserve. Start by power or pressure washing durable materials like vinyl siding and concrete pavement or driveways, then switch the tips on your machine and finish up by soft washing the more delicate elements, like shutters and front doors, for example.