Over time, a residential driveway can become an eyesore from leaked motor oil, tire marks and other stains. Muriatic acid, also referred to as a form of hydrochloric acid, is an extremely effective concrete cleaner -- with emphasis on "extreme." Muriatic acid, typically diluted with water, reacts with the alkalinity of the cement and "etches" the surface, dissolving surface stains and foreign material. The basic safe procedure to clean with muriatic acid is easy to follow and will help restore the appearance of your driveway's surface.
Put on all protective gear, including boots, gloves and glasses.
Mix muriatic acid with water for the desired solution, based on the manufacturer's recommendations.
Pour a small amount of the acid-water mixture carefully onto the concrete surface, beginning with a concentration on specific stained areas of the driveway. Allow the mixture to saturate the stained area for approximately 10 minutes to dissolve the material.
Scrub and spread the acid solution over the concrete surface using a floor brush. Use a wire brush on difficult stains or built-up material. Add more acid mix as needed.
Rinse the driveway thoroughly with clean water.
Repeat Steps 2 through 4 for stubborn stains or problem areas.