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If you've spotted brown, black, or green stains in your toilet bowl, chances are it's limescale. Limescale results from hard water, leaving deposits such as calcium and magnesium in toilet bowls.

One might think that a splash of bleach is the ticket to a spotless toilet, but those pesky discolored stains are mighty immune to such a straightforward fix. Limescale, that irksome deposit left by ...

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