Myth Busters confirms that washing feet in vodka is an effective means of controlling foot odor. Wash thoroughly and pat dry with a clean soft cloth.
I would get rid of/replace any old sneakers or shoes with absorbant soles.
When I worked as a Ski Instructor I used to use underarm deodorant on the soles of my feet. Dry feet are warm feet and being in ski boots all day they will get pretty rank if moisture is not controlled.
Remedies for Foot Odor | eHow.com