If the bottoms of your feet are rough and dry from barefoot Summer fun and open shoes you can rid the hard, dry layers of skin caused by sun, sand, and other elements by making a mixture of 5 crushed aspirin tablets and one tablespoon of water. Slather this on your heels and other dry areas. Wait 15 minutes then rinse off and buff with a soft pumice stone. The salicylic acid in the aspirin softens the dead skin so it will slough right off.