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How do I permanently get rid of this discolouration in my bathtub? (I have hard water)
(sh.itjust.works)
I've tried scrubbing it several times with bar keepers friend soft cleanser and although it improves, it never goes away completely and it always comes back.
I can't see anything, but I second vinegar.
Apparently the trick to cleaning is to use acids and bases where appropriate. Acid will work here afaik.