A few months ago my feet started sweating excessively, whether hot or cold, when wearing shoes. It didn't smell that bad but the wetness was very uncomfortable.
I read somewhere about a black tea soak remedy and it worked.
Brew strong black tea (cheap stuff you make iced tea from is fine) and when it's cool enough soak your feet in it for 30 minutes. I did this once a day for 10 days and my sweating pretty much went away. After about 2 months the sweating started again, so I just started soaking my feet again, and it's already getting better after 4 or 5 days of soaking.