Treating Cracked/Blackened Feet - 1. Put shaving cream on your feet. 2. In a bucket/sink, combine equal parts warm water & Listerine. 3. Soak a hand towel in the Listerine solution. 4. While shaving cream is still on feet wrap the towel around your feet & let sit for 30 min. 5. After 30 min., use towel to rub calloused/dead skin off your feet. 6. Apply a healthy amount of lotion.