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On average, pressure washing a house can take anywhere from 30 minutes to three hours. The time frame to pressure wash or power wash your home, fence, or other property depends on the size of the project and the complexity and accessibility of the areas that need cleaning. Part of the time required to complete the job includes setup and removal of equipment needed. A two-story house with a steep roof may require working from scaffolding or a ladder, likely adding to the time required to finish the project. 

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.

Yes, you can pressure wash epoxy floors, but you must take precautions to avoid damaging the surface. While most epoxy floors can be cleaned with a mop, you might choose to pressure wash if the floor is stained, has ground-in dirt, or is covered with mold or mildew. To do so safely, first soak any stains or dirty areas with a gentle cleanser. Use a lower pressure setting with a gentle nozzle, such as a green, white, or black tip, or a 45-degree angled tip. Keep the spray nozzle at least 18 inches away from the floor to protect the surface. Using a surface cleaner attachment or a rotary scrubber can also help prevent overspray. Be cautious if using a power washer that heats the water, as the combination of heat and pressure may be too powerful and could damage the epoxy coating.

Some homeowners have luck using pressure washers, but this only works for old or weaker concrete sealants and with very powerful pressure washers. You’ll get better results by pressure washing water-based sealants. However, it’s worth trying on any sealant if you’re hoping for the least toxic, least expensive, and most DIY-friendly option. To try this method, rent or buy the most powerful pressure washer you can find and take several passes at the concrete, completely pressure washing the entire area. You may need to repeat the process multiple times to see results.