Yes, muriatic acid does a great job at removing paint and residual stains from concrete. However, muriatic acid should be handled with care and only by adults. The chemical needs to be mixed with water and if the proportions are mixed incorrectly, it can etch the concrete surface. Additionally, if the muriatic acid is left to sit on the concrete surface for too long, it could result in etching. If you plan on using muriatic acid, it’s essential to wear personal protective equipment at all times as it will damage your skin and clothes. Be sure to wear heavy, acid-resistant gloves and boots as well as a respirator mask when working with muriatic acid.
Begin by mixing a solution of 1 part muriatic acid and 8 parts water in a bucket or large container. Pour the acid last to prevent splashing.
Pour the whole solution over your concrete surface.
Use a wire brush or hard-bristled broom to remove any stains or paint.
Rinse the concrete surface thoroughly with clean water to remove any residual muriatic acid.