It removes calcium, lime and hard water stains using gentle abrasive action and cleans porcelain, pool tiles, toilet bowls, barbecues, steel and stone.
Promising reviews: “I have a 19-year-old bathroom that had accumulated some nasty stains over time, and even regular toilet brushes and cleaning products were not able to remove them. I decided to try this pumice stone, and it worked like magic! Given the nature and severity of the stains, it was a lot of effort. But 10 minutes later, I had a brand new bowl, and I couldn’t see any scratches on it.,Happy Retirees
Buy it from Amazon $13.99,