Hey people,
so I was cleaning my husband's shower using some 'biodegradable' cleaner and sure enough it bio-degraded his tile

It shows as the stains on the tile that are much lighter than the tile itself. I have one of those beigy stone looking tile that seems like it is ceramic in reality.

So I tried to take the stain out by brushing the tile down and it seems to be working but I am afraid of screwing with the top layer and possibly getting something uglier than the stain, like mold or something.

Does anyone have any advice for me?
Thx.
Sanja

Usually tile is pretty resistant to staining and it's the grout that gets damaged. You may just have surface buildup of some sort. Try vinegar and warm water and lots of scrubbing. Avoid cleaners with any grit in them. For heavy duty cleaning I use Muriatic acid, but it can corrode your skin and your lungs, so may not be the best DIY solution.