These white streaks may be hard-water deposits, which can prove very difficult to remove. Suggest that they try a sulfamic acid-based tile-and-grout cleaner. CAUTION Make sure to let them know to NOT use sulfamic acid or any acids on marble. Acid... Read More

Q. What are those white dots on my white marble?   A. This article, by Frederick M. Hueston, Stone Forensics, provides the answer.Have you ever wondered what those white dots are on white marble? You sometimes see thousands of them in high... Read More

Q. Dear Sir/Madam, i have laid kota stone on my all stairs and corrie doors. after installation of stone, there were few stains on the paints and concrete stain while laying stones. As we didnt know, how to clean the stone, we used thinner and acid... Read More

Q. I just bought a house with coquina tile that has not been cleaned in decades. We contracted a limestone expert (after interviewing 4 companies, 2 of which were not familiar with what coquina tile was) to clean them. They ground the floor and then... Read More

Q. On a new polished Carrara countertop, we placed a sheet of glass over part of it ...at the side with no glass covering, the marble is darkening. It does get wet and darkens but doesn’t seem to entirely lighten when dry. It also gets sun... Read More

Q. We just recently had a white marble installed on our bathroom floor and just noticed the section that is getting no sun from our window (it is being blocked from our tub deck) is yellow. It does have a heating system installed under it. Do you... Read More

Q: Why did my beautiful white marble suddenly begin to turn yellow?   A: Unfortunately, this problem is not uncommon. There are a number of causes for yellowing marble—and a number of possible cures.   The most common culprit is iron, which... Read More

Q. Five years ago we built a home with a stone veneer front. We had water problems the first 4 years where water was leaking into several rooms and the basement coming from the front of the house. The stone was removed and replaced a couple of times ... Read More

Q. My new marble floor has a white powder on it. It cleans up with water, but keeps coming back. Is there anything I can use to clean it off permanently? A. This is a common condition, especially if the floor is new. When the marble is installed, it... Read More

Q.  Hi. I just had a question about being able to remove some water stains on a granite countertop. I worked in August on two tables, which are granite and the white, somewhat sparkly you know, on it. It seems like they were retaining the water... Read More