Scholl Corn & Callus Removal Liquid Scholl Corn & Callus Removal Liquid effectively removes painful corns & calluses & provides gentle pain relief. Ingredients The active ingredients are Salicylic Acid (11.25% w/v) & Camphor (2.8% w/v). The other ingredients are pyroxylin, castor oil, methoxyisopropanol, & acetone. Directions Ensure feet are clean & dry. Apply a thin film of liquid over the corn or callus using the applicator provided & allow to dry. When using pads to relieve shoe pressure & friction, confine the application of the liquid to the area of the skin covered by the central part of the pad. Repeat treatment twice a day until the corn or callus can be removed.