Briefly, soak feet in warm water. Use the brush with soap to clean feet and toenails. Use the rasp to gently scrape dry, callused skin being careful not to rub too hard on the skin. Next, gently smooth away rough skin with the smoothing file using light pressure and a circular motion. Follow with the emery file, rubbing in a circular motion for final smoothing. Repeat as needed to maintain soft, smooth skin.