I don't clean mine, they might get vaguely dry standing in the kitchen before I wear them the next day, but really, life's too short. I barely get enough time to run, never mind polish my shoes. Having said that, I've come to the conclusion that the dirt around here is pretty corrosive. Pair of (lightweight) shoes came to the end of their life last night. New in December, maybe 300 miles tops.
Edited: 16/04/2013 at 16:31