When my shoes start to get all funky smelling and ratty looking on the inside...I throw them away and buy a new pair. But it hasn't happened to any of my shoes yet, with the exception of a pair of sneakers that I used in high school.

Buy moisture wicking socks...then perhaps your shoes won't be so sweaty on the inside anymore.

And if you're already so concerned about shoes...what about the inside of your gloves?? Do you wash your gloves after every ride?