Tile in new house appears to be rusting

L'Anda Johnson
November 29, 2019

We just bought a new house (new build) and there are tiles in the shower that appear to be rusting. It is very odd. The rust marks will vary in color getting lighter at times and darker at other times. The builder thinks it is a stain that can just be cleaned but regular cleaner doesn't work and I don't want to use anything harsh as it would mess up the natural stone. Any thoughts as to what it could be? I feel like it has to be coming from below.

It also appears like the grout in the corners never dries - not sure if this is causing the issue.

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