This formula is meant to break down calluses in just 3-5 minutes, then you simply buff them away. Directions: Liberally spread Callus Away over callus. Allow to penetrate 3-5 minutes, depending on callus buildup. Then use a file or buffer to gently remove callus. WASH THOROUGHLY WITH WATER AFTER USE. For excessive callus buildup the process may be repeated. For optimal results, soak callus before applying.