Q. What is the best way to remove a blue stain on flagstone caused by plant fertilizer? It is several days old. The flagstone is an outside border on a raised planter bed. A. Blue fertilizer stains can be challenging on flagstone, especially outdoors... Read More

Q. After making homemade bath bar soap (consisting of tallow, coconut oil, palm oil, and lye), upon removal from the forms, we placed the soap blocks on wax paper and set it on our quartz counter tops. After being gone for a few days, we returned to... Read More

Q. I just received a new quartzite install, and there is a crack at the sink extending to the hole for the soap dispenser. The fabricator claims it does not affect the integrity of the stone, since apparently it's not a full-depth crack, and... Read More

Q. What is the best way to clean a white marble bathtub? What is the best way to keep it clean? What shampoos and soaps should be used by people in marble bathtubs? A. It’s great that you’re thinking proactively—not just about... Read More

Q. I purchased an oil stain remover poultice and used it on my light, whitish-gray quartzite to remove a very faint oil ring. I only used the product on one section. Now, that area is white, almost bleached. From what I can tell, the stain is gone. I... Read More

Q. 25 years ago, our painter applied a sealant, possibly epoxy, polyurethane, or acrylic, to a new flagstone interior entry. It‘s held up beautifully. We are about to install flagstone in a small breakfast room. We want to retain the color of... Read More