Stone sealant should be applied once a year to protect the grout and natural stone from the elements. If stone and grout becomes soiled, use a mild detergent with water and a soft cloth / soft brush for cleaning only. Do not use abrasive cleaning products. Avoid cleaners containing ammonia, bleach, abrasives, or other hazardous/polluting compounds. Always test in small inconspicuous area while using a new cleaner to ensure compatibility.