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Cleaning blue (copper?) stains in white Kohler cast iron tub

Laura Grosmaire
2 years ago

We have a relatively new tub (less than one year) that is getting blue stains in it. Since we have copper piping, I assume that is what is causing this. Any suggestions for cleaning? Are there rules about basic (bleach) or acidic (vinegar) relative to cast iron? We do use bleach in our cast iron kitchen sink for berry stains, and it hasn't been a problem (yet), but if there are guidelines relative to this, I'd love to know them. And I don't know if bleach will work anyway with the copper deposits. We are on well water too, FWIW.

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