Put protective gloves on. Soak a cotton pad in the lotion and place it topically on hard callused areas, avoiding soft skin. Wrap the area and leave it on for 5-10 minutes. Unwrap and remove cotton pad. File the area, rinse thoroughly with water and use moisturizing lotion onto the skin.
Optionally before applying the callus softener lotion, soak feet in warm water for about 5 minutes to soften the treated area, pre scrub the surface slightly, with pumice stone or foot rasp or electric file and dry thoroughly with a towel. Then continue as described above.