Hello, iv heard of a few cases like these, a few ppl have tried and swear by the following - 1. make sure there are no cuts first an soak their feet in a bucket wit a lil bit of bleach in. 2. In boots u can get purple tablets that u put in water an it will harden their feet just ask them they wil know what tablets your on about. 3. Run them on the road to harden their feet.