If you want to clean paint off a concrete surface, make sure the cleaning products are legal for use in your area. Some of cleaning products might violate the Volatile Organic Compound (VOC) regulations. Also, be sure the products you plan to use are meant for cleaning concrete and are recommended for use in paint removal.
You may have to use a bit of "trial and error" because not every product does what it claims to do [source: Balogh].
Here's how to clean paint off a concrete floor:
- Sweep the floor to remove any debris.
- Apply a paint stripper to the stain. Be sure to use a paint stripper that is safe for use on concrete.
- Let the paint stripper sit on the stain for about half an hour, or as long as indicated by the directions on the label.
- Scrape off the paint stripper with a plastic scraper. The loosened paint will come off as well.
- Repeat steps 2 through 4, if necessary.
- Scrub the concrete with a nylon brush and some scouring powder and water.
- Rinse the area with more water [source: Family Handyman].
Some natural products, such as those made from soybeans, may also remove paint. These may not work on all paints because they're less aggressive, but they are safer to use and easier to dispose of legally [source: Balogh].