To clean concrete floors, scrub them with a bristle brush, warm water and a multipurpose detergent. If the floor is stained, apply ammonia or hydrogen peroxide to the stained areas before scrubbing.
- Gather supplies
You need a bucket, bristle brush, detergent and a wet vacuum. Since concrete is porous, stains can be difficult to remove, so you may also need hydrogen peroxide, ammonia, or TSP (trisodium phosphate).
- Clean the floor
Using a bristle brush, scrub the concrete floor with warm water and a multipurpose detergent. If the floor is stained, apply TSP, hydrogen peroxide or ammonia to any obvious spots, and then scrub the stains. If the floor has a drain, you can also use a pressure washer to aid the cleaning process. For stubborn stains, you can apply a stronger cleaning agent such as muriatic acid, though you need to take great care to follow use instructions carefully, as it can be hazardous. If the floor does not have a drain, use a wet vacuum to clean up the water.
- Seal the concrete
To prevent further staining, seal the concrete floor. Spray or roll on a water-repellent siloxane- or silane-based sealer. If you have no concrete sealer, masonry primer and topcoat also do the job.