How to Remove Hard Water Stains in a Toilet

Scrub With Sandpaper

Another option for scrubbing very stubborn hard water stains in the toilet is 0000-grade steel wool (0000 is the finest grade). Steel wool cleans by itself or with plain water, but you can also use it with household cleaners. Be sure to use 0000-grade steel wool to prevent scratches to the porcelain surface. 

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