There are a few steps you need to follow if you have painted concrete. You should start by removing all floor and wall coverings and paint. If the paint was oil-based, the process will be a little more difficult. Oil-based paint can be difficult to remove and may require more elbow grease. Once you have removed all the paint, you should use a scrub brush to remove any remaining residue. You may also want to use an alternative to TSP.
If you don’t have a wire scrub brush, you can use a paint scraper to remove loose paint. The use of a chemical-free solution can help you achieve this goal without causing harm to the concrete surface. Also, you can use latex paint to remove paint from concrete, as it is easier to strip than oil-based ones. But you need to take into account that spray paint tends to go on in layers, so you might have to apply it several times before the paint comes off.
If the paint is stubborn or difficult to remove, a homemade paint stripper is an excellent choice. You can purchase one from a store or mix it with cat litter or clay. Afterward, you can apply it as you would any other stripper. And if you want to make your own paint stripper, just use an old paintbrush. You should be able to see bubbles and paint coming off of the concrete surface after a few hours.