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It depends on the type of surface, but if you’re preparing to pressure wash a driveway, you’ll start by using a broom or leaf blower to get rid of dirt, leaves, and other debris. Then, move any nearby items (like outdoor furniture and potted plants) and cover in-ground plants with a tarp or plastic sheet. After that, you can apply degreaser spray or another pretreatment solution to any stains and scrub them with a stiff brush before pressure washing.

Yes, acid washing can change the appearance of the original brick stain color. It removes dirt, and efflorescence, often revealing the brick's original color and restoring its natural beauty. However, if not done carefully, it can also cause slight variations in color due to the cleaning process.

Concrete does well with a number of cleaning agents, as it’s a durable material. Choose from acidic cleaners, alkaline cleaners, and pH-neutral cleaners, in addition to antibacterial solutions. Your best bet is to simply read the fine print with your preferred detergent and make sure it mentions concrete as a viable surface. 

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.