Use: A few drops of dishwashing liquid and warm water.

Tools: A cloth, sponge, or mop.

Tips: Sweep or vacuum stone floors regularly; stone surfaces are susceptible to damage from grit. Rinse with a clean, soft cloth. Apply a penetrating sealer, available at stone dealers and home centers, every two to three years to prevent deep stains. Avoid abrasive cleansers, which can scratch, and ammonia and nonchlorine bleach, which can dull the surface.

Tough stains: Use a ready-made poultice, available at stone dealers.