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Yes, vinegar can remove polyurethane from wood, but it is a slow, inefficient, and inconsistent restoration method. Whatever your intention, it’s best to avoid using vinegar on wood with a polyurethane finish—though it can be an effective cleaner for other wood finishes.

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.

You can apply stain over peeling stain, but it’s not a good idea. Your old stain will get in the way of your new stain bonding to the wood, so you’re likely going to see the same issue again shortly after application. Your best option is to sand off the old stain and clean the surface thoroughly before applying new stain.

Sanding paint that contains lead is never safe, and sanding modern paints can still be hazardous. However, you can protect yourself by wearing a high-quality respirator during the process or by using a wet-sanding technique. You can wet the wall and then sand or use a wet sanding tool to achieve this.