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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.
It's really good on rust. I used it on some 50 year old tools and they came out of a 2 day soak looking new.
I have since learned about better rust removal chemicals from Adam Savage and Project Farm on YouTube but the citric acid has worked well for me.