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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 epoxy application ended up a bit messy and left spills behind, there are several ways to clean epoxy off of a concrete floor. You can use a power washer with at least 3,000 PSI. However, it may be easier to use a scraping tool or an acidic cleaner, like vinegar, to remove unwanted epoxy. 

If the entire floor has epoxy and you want to remove just excess epoxy stains, these methods could still strip parts of the epoxy floor. Move carefully and in small areas to minimize damage, or call a pro for an expert finish.

You can certainly utilize a pressure washer to effectively clean your garage floor. If you're dealing with oily residue, consider adding a degreaser to the pressure washer solution. Prior to using the pressure washer, make sure to thoroughly sweep the garage floor to eliminate any loose dirt or debris.

Begin the pressure washing process from the back of your garage, which is closest to your home, and work your way towards the front. This ensures that the water and dirt are directed outside. In case you've applied a cleanser or degreaser, it's a good idea to give the floor another pass with clean water using the pressure washer to ensure a thorough rinse.

Regular maintenance will help you avoid costly repairs and early replacement. Clean the driveway surface with a stiff brush and water at least twice yearly, and remove any weeds that try to take root. Additionally, every two to five years, apply a sealcoat—this protects the driveway against damaging UV rays and keeps it looking like new.