Our bathtub is an older, porcelain style tub. We have very hard water in our town and we do not have a softener. Now the tub has developed some gray looking spots on the bottom and I have no idea how to get rid of them.
I have used everything from bleach to CLR (calcium lime rust) cleaner advertised by Paul Harvey. The CLR may have made just a slight difference, but only after I let it sit for a while and it wasn't nearly enough of a difference.
Does anyone know of anything that REALLY works on spots like that? I am thinking they are just soap scum and hard water deposits, but I guess I'm not really sure. Any suggestions?
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