Step 5 · Scrub Stains with a Pumice Stone
After the cleaner has had time to work, begin the physical removal process. Submerge a pumice stone in the liquid at the bottom of the bowl to get it wet. Using gentle but firm pressure, scrub the hard water stains directly with the wet pumice stone. Use a circular or back-and-forth motion. The stone will wear down and create a paste, which aids in the cleaning. Continue scrubbing until the mineral deposits are gone. For areas that are less stained, a stiff-bristled toilet brush can be used.