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Oil can permanently stain a concrete driveway if it fully dries or sits for weeks without cleaning. Concrete is porous and absorbs the oil deeper over time. That’s why it’s best to remove an oil stain when it’s wet by applying an absorbent material, sweeping the area, applying dish soap, scrubbing, and then rinsing.

It is generally not recommended to use dish soap in a pressure washer. Dishwashing liquid is formulated for cooler water, and the warmer water used in a pressure washer can create excessive suds, potentially damaging the machine's tubing and other components. Always check the manufacturer’s instructions for recommended detergents. If you find yourself in a pinch, you can try a highly diluted solution, such as one tablespoon of dish soap per 1.5 quarts of water, to avoid clogging the machine.

Combined with a cleaning agent, pressure washers and power washers are highly effective at removing driveway stains. However, these machines are not gentle, putting your driveway at risk of damage. Instead of renting a power washer yourself, ask a professional pressure washer for a consultation.

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.