This is an issue I see frequently on carrera in showers

I could use some input on carrera shower walls installed about 2 years ago and was never sealed,

There are yellowish stains about three to four inches and vary in shape.i know Its not soap build up.

Maybe some iron content in the stone reacting to moisture but its not really rusty looking or a least not yet.

Any ideas on this would be greatly appreciated. Also any good poultice recipes I might try putting on for a

couple of days for this type of problem.

There are some tiny pin holes in some of the tiles maybe about 10 of them each have one pin hole and they are not all

Next to each other. Any thoughts on what might cause this??

Thanks a bunch

Ken De Melis

Marble Perfect