Shake well before and during use. Not for use on acrylic, brass or unsealed granite or marble. Spot test in an inconspicuous area for all other hard, non-porous surfaces. Non-staining formula when used as directed. 1. Spray 6 to 8 inches from surface to be cleaned. 2. Watch as blue foam powers through soap scum and hard water stains. 3. When foam turns white, wipe with a wet cloth or sponge and rinse with water. For heavily soiled areas, repeated use or longer contact times may be required. Store can in a cool, dry, well-ventilated area out of direct sunlight.