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Use degreaser to remove oil and grease stains. Sand off any rubber residue. Vacuum up any remaining cleaning products or debris. Use a pressure washer to deep clean the floor. Etch the floor Neutralize and remove the acid. Rinse the floor with clean water and leave it to dry overnight. Patch any cracks with an epoxy crack filler.

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Mop your entire floor using an industrial degreaser or solvent-based cleanser. After you allow the floor to dry, look for any remaining oil/grease stains. Spot clean these areas with a concrete degreaser and a stiff scrub brush. Then rinse the entire floor with clean water. While you were cleaning the floor, you may have noticed some areas where tire rubber was deposited on your floor. If any tire rubber remains after mopping and spot-cleaning, use sandpaper to remove it. Attach fine grit sandpaper to a pole sander, hand sander or floor sander. Rinse with clean water. 180-grit sandpaper is a good choice. Use an industrial strength vacuum to thoroughly suck up any dust, leftover cleaning powder, and other dirt. Leftover debris can cause bubbles and imperfections in your epoxy coating, so remove it all. Using an industrial power washer, spray down the garage floor so that any remaining impurities make their way out of the garage or toward a drain. You can rent a pressure washer from many home improvement stores or other rental outlets in your area. . Purchase muriatic acid (also called hydrochloric acid) from a home improvement store. You will need about 0.25 gallons (950 ml) of muriatic acid for every 50–70 square feet (4.6–6.5 m2) of floor. Always follow the manufacturer’s instructions, but here are some guidelines:  Hose down the floor. Mix 1 part muriatic acid with 3 parts water in a plastic bucket. Use a plastic watering can or pressure sprayer to coat the floor with diluted acid. Wait until the acid stops bubbling (about 2-15 minutes). Mix 8 fluid ounces (240 ml) of baking soda with 1 gallon (3,800 ml) of water. Apply this mixture over the floor to neutralize the acid. Some muriatic acid products will not need to be neutralized. Follow the manufacturer’s instructions. Pour clean water onto the floor to rinse any remaining acid and neutralizer into the nearest drain. Let the floor dry overnight before doing any more work. After the floor is completely dry, examine it for cracks. Any cracks that are 0.25 inches (0.64 cm) or larger, as well as any holes or spalled areas, will need to be filled in with epoxy crack filler. Place the product into the opening, then use a putty knife to scrape it down to surface level and smooth it out. Let this dry for 4-6 hours.