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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 can whiten concrete for unsealed and unfinished concrete with a solution or either muriatic acid or bleach and water—but never both. However, if your concrete does have a stain, finish, or polish, keep in mind that these hard chemicals could damage the topcoat. Your best bet otherwise is to power wash outdoor concrete slabs or clean indoor ones with a gentle cleaner such as laundry or dish detergent.

For pressure washing a driveway, a PSI (pounds per square inch) between 2,000 and 3,000 is recommended for both concrete and asphalt surfaces. A pressure of 3,000 PSI is ideal for deep cleaning without causing damage, effectively removing debris, dirt stains, and even oil spills. If your pressure washer has a lower PSI rating, you can still use it, but the cleaning process will take longer. For a more efficient and even clean, consider using a surface cleaner attachment.

Yes, you can pressure wash with just water. The force of the water alone is often enough to remove dirt, grime, and debris from many surfaces. However, for tougher stains like grease, mildew, or algae, adding a detergent or cleaning solution can enhance the cleaning power. Be sure to use the appropriate nozzle and pressure settings for the surface to achieve the best results without causing damage.