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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.
Paste of Comet and peroxide
What does the peroxide add? Whitening?
Yes the peroxide is a bleaching agent. Milder than chlorine bleach