What causes the ring of grime in a toilet that is never used?
it is the minerals from the hard water. even the moisture from the underground pipes or installation of the new toilet would cause this. My home was new, toilet new, and the same thing happened. A little CLR will get rid of that,
It could be minerals, dust, or reactions on a chemical level from certain materials used in the parts of the toilet. Usually it's cleaned away quickly and easily.
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