Lime or hard-water mineral buildup is dissolved by an acid. Vinegar or lemon juice may be rubbed over the stain, to dissolve. Do not leave on stain too long, as acids will eventually damage surface of porcelain enamel. Rinse thoroughly. Commercial products designed to remove lime deposit may be used if label says safe for the surface. Do not use acids on fiberglass, nor any commercial product unless label says safe for fiberglass.
[Info from the Home Maintenance And Repair Database at the Michigan State University website]
Answer
Best thing I've found is a product called C-L-R and it works like a charm.
First answer by anonymous. Last edit by Sdresh. Contributor trust: 360 [recommend contributor]. Question popularity: 157 [recommend question]





