Ensure feet are clean and dry. Use the coarse side of the file to remove hard skin. Then use the finer side for a smooth and refined finish. After use, wash the file with warm water and leave to dry naturally. The experts at Scholl know that the best way to treat hard skin is first to soften then remove so have created a range of products specially developed for hard skin. 1. For best results, use Scholl Hard Skin Softening Cream. 2. Regularly remove hard skin using this file.