Babe's Spot Solver was developed to remove hard water spots caused from mineral buildup. This non-abrasive solution is safe for all gel coats, glass, and chrome surfaces. Just spray a light mist directly on the surface area that requires treatment, and Spot Solver continues to work as it sets on spots. Leave for up to 20 seconds, and wipe with a damp towel. Should not be used on surfaces other than specified on the container.