Forum Discussion
TucsonJim
Apr 21, 2014Explorer II
Bar Keeper's Friend is a mild acid powder which I've used in the past for some yellow spots in our shower. We had a floor mat, but it sounds a little different from yours. On ours, the sun would shine through the cracks in the floor mat and yellowed the tub. Bar Keepers Friend worked for us to get rid of most of it.
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