The pumice stone can exfoliate away calluses, stains and dead skin and will leave your skin looking fresh and smooth. You can wear any shoes you want (or even go barefoot) without worrying about how your feet look. How to Maintenance The Pumice Stone Rinse your pumice stone thoroughly after use and hang it up to dry. When the pumice stone hole get clogged, you can clean it with a small brush such as an old toothbrush. Use after month, you should boil the pumice stone in water for five minutes to deep clean it and kill any bacteria. Notice Don't use a pumice stone on sore, red areas or open skin. Never attempt to remove hardened skin or calluses with metal tools, razor blades or steel wool volcanic pumice stones are completely safe