This product is for removal of difficult, hard water stains and soap scum in all areas of the restroom including tile and grout surfaces, countertops, sinks and toilets. Use on acid resistant surfaces only. Do not use this product on marble, aluminum, terrazzo, Formica® or carpeting. Test in an inconspicuous area before use. Contains acids, do not use with bleach, ammonia or any other chemicals. Spray product on surface to be cleaned. Allow clinging foam to contact surface for 4 - 6 minutes to penetrate deposits. Wipe with a sponge, cloth or brush.