Works to remove 30 years of hard water stains
These work great for removing hard water stains from the toilet and my porcelain sink!  Yes they are soft and wear down fast, but that is kind of the point.  The stone wears down so your porcelain doesn’t<br /><br />It took 1/2 a stick per toilet but we went from 30 years of hard water stains to a pristine new toilet.  The handle made it easy to get up under the rim.
Rating: 5 stars