Whether it rains or not, I also make it a habit to put baby powder in my shoes. When powdering the inside recently I had an idea, why not powder the outside as well?
It's not like I'm going to wear my shoes to the Enchantment Under the Sea Dance or anything, and I figured the powder would just disappear after a few days. After one ride to work they looked like this -
And a couple of days later my shoes were back to normal.
And maybe it's just my optimism, but I don't think they smell as bad anymore either =)