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. I have interior darkly stained flagstone floors throughout the house and very difficult to clean with uneven surfaces. Can I use a steam mop on them without damage or lifting the color? A. Steam mops can damage natural stone, including flagstone,... Read More

Q. How do I remove cactus liquid from flagstone? The cactus was trimmed and the liquid splattered on the flagstone. It was not rinsed off right away and left several stains. A. You’re not alone. Cactus sap can surprise people with how quickly... Read More

Q. My pickling vinegar bottle (7 percent acidic) leaked on my flagstone floor. I made a paste of baking soda and applied it after washing the floor with stone floor cleaner. I let the paste sit for the afternoon to no avail. I would appreciate any... 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