I've been climbing for a few months and my gym sells old rental shoes at a discounted rate. I bought some as a cheap way to get started. I always wear socks when I climb but I've noticed the majority of people don't and I read that it's a bad idea to go sockless with rental shoes because of athlete's foot and such.
I'd love to see what all the rage is about climbing without socks, but want to know if there's a way I can clean my "new" shoes first in order to avoid athlete's foot and all the other fun stuff.