Personally, I'm not a big fan of the beaten-up appearance. I typically rub my thighs with a quick wipe with water, and then dry them off later. It seems like a basic cloth would be helpful. Perhaps a brown shine for your shoes If that's what you prefer. Treat them as the other shoes made from leather.
However, the main thing I'm going say is that the Sperry's will reek if you don't wear socks (please don't wear them while wearing socksthey look odd). Dryer sheets help keep them fresh inside.