Q. The floor of my shower stall is covered with grouted sliced stones on mesh. The contractor sealed the floor with a "wet-enhancing" sealer about 3 years ago. I've noticed that the lighter stones have become rust-colored. (We have hard water... Read More

When poulticing a rust stain on a marble floor, the stain can become darker and more wide spread. What is happening? Chances are the source of the rust is under the tile. A nail or metal object may have been left behind when the tile was installed.... Read More

Q. I randomly stumbled on your website. I have a quick question if you’re willing to share advice. I have marble (or it’s quartzite) in my bathroom, and somehow it’s rusting where the faucet is. The stone is changing a rust color. I... Read More

Q. I am wondering how to clean the marble step into our bathroom shower. It has a lot of dark brown crud -- I'm assuming it's mineral deposits -- that have built up over the years where the aluminum frame of the shower door meets the marble... Read More

  Q. I have a shower floor that has small stones of different colors and it is yellowing in 3 places. This started right after it was installed. Someone told me it was iron in water. How do I get rid of the yellowing? It's in the grout and on... Read More

Q. I am having problems with my new marble paver Florida patio. The stone is turning yellow on the edges. I have some success with cleaning, but the yellow keeps returning, and it seems to come back a little worse each time. Thank you!   A. The... Read More

Q. Is granite sensitive to acids? A. Unlike marble, granite is not a calcite based stone and is not generally vulnerable to acids. However, some stones, even though they are marketed as granite, may in fact have calcium in their makeup. Furthermore,... Read More