We have hard water where I live. My bathtub is white, but for some reason, it is getting grey stains on it. I have tried every product that I can think of, none of them has helped remove the stain. I filled the bathtub and put a full bottle of bleach (4 litres) in the water hoping this would help, and left it overnight. It did nothing. Is there anyone who could please help me. Thanking you in advance.
I buy a thick toilet bowl cleaner with bleach and let it sit on the enamel for about an hour. When I rinse it off, it is sparkling white again. I have an antique clawfoot tub, so it might be a different finish. Be sure to do a spot test.
This could be a combination of soap film and hard water residue. If vinegar doesn't work, try CLR, as that will remove most kinds of hard water buildup.
After searching a few websites, I learned you can use a mixture of peroxide and cream of tartar to make a paste and scrub over the area with a toothbrush.
Also, you can mix fresh lemon and vinegar together and wipe over the area or place a cloth dipped in the solution over the stain.
If you see any improvements, but not enough; then I would suggest reapplying.
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