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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.

Yes. You can pressure wash pavers. However, you risk damaging them if you use too much pressure or get too close. Use a PSI of 1,500 and spray the water at least 24 inches away from the surface.

Not pressure washing your driveway can lead to several consequences that affect both its appearance and its structural integrity over time:  

• Reduced Curb Appeal: A dirty driveway covered in grime, stains, and mildew detracts from your home's overall appearance.  

• Safety Hazards: The buildup of algae, moss, and mildew creates slippery surfaces. When wet, it increases the risk of slips and falls for you, your family, and visitors.  

• Structural Damage: Dirt, debris, and organic growth can trap moisture against the driveway's surface. In colder climates, this moisture can freeze and thaw, leading to cracks and deterioration of the concrete or asphalt.

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.