How can I remove water stains from polished marble window sills?
— D.R., Sunset Hills A: Marble is a porous stone that attracts stains from all manner of liquids, including water. Make sure while cleaning marble that you use natural cleaning agents so you don’t damage it. Examples of natural cleaners include baking soda, hydrogen peroxide and cornstarch. Always blot the stain instead of wiping it. You should use paper towels, cotton balls or gauze. This will help absorb the stain back out of the material.