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Q. We have mold buildup in grout joints and surface has film on it. What is best to clean mold and remove film from surface?   A. There are several cleaners that will remove the mold but you must be careful to choose one that will not damage the... Read More

Q. I am trying to learn more about Rainbow sandstone for a bathroom floor. We can get some tile that is 1" thick but I wonder if thinner sandstone is available, and is thinner okay to use? I only can find suppliers from India; very little on the... Read More

Q: I'm trying to determine what products to purchase for a travertine shower with pepple floor, and a marble countertop. How often is stone-safe cleanser intended to be used? And what is the difference between pH neutral cleaner and other stone... Read More

Q: How can I remove etching that has formed on my Lagos Azul floor from cat urine? I cleaned it up pretty quickly but I see etching. A: Etching is the result of any acid coming into contact with the stone. Unfortunately the only way... Read More

Q: Are kadappa black, kotah and shahabad yellow stone good dense stones? can they be used in interior flooring? In India one of the top companies is indicted on doctoredstone.org so it is very difficult to trust any vendor. In such a... Read More

Q. I have a Limestone tile and someone let the polish dry in the grout. How can I remove the polish from the grout? The grout was not sealed. The product was granquartz stone polish. A. Try applying a neutral cleaner to the grout where the polish... Read More

Q. How would I get rid of calcium buildup on a headstone? The primary surface is polished and where the engraving is it is rough. The calcium from the hard water has caused a buildup, especially in the rough area. What should I use to get the... Read More

Q. What is the proper grout for an exterior limestone walkway? Is there a dry grout that can be swept between the stone? Where would I look for stone dust? A. The proper grout will depend on how the stone is set. Will it be set in mortar or placed on... Read More

Q. What is the best cleaner to use on limestone floors? The floors in my bathroom are starting to look very dirty, with grayish marks and spots all over. A. It sounds like your floors have been etched -- probably by using an acid based cleaner. Many... Read More

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