Soak your foot/feet in vinegar. It is a natural disinfectant, and also works for the kind of fungus that causes foot odor. I have several friends who had their children soak a couple times a week, when they were going through a "stage" where they had it all the time.
Here are some ideas:
Take frequent soaks. Various soaking agents can help keep the feet dry, which may also control odor.
Tea. Tannin, which can be found in tea bags, is a drying agent. Boil three or four tea bags in 1 quart of water for about 10 minutes, then add enough cold water to make a comfortable soak, instructs dermatologist Diana Bihova, M.D., clinical instructor of dermatology at New York University Medical Center in New York City.
Soak your feet for 20 to 30 minutes, then dry them and apply food powder. Dr. Bihova says to do this twice a day until you get the problem under control. Repeating it twice a week thereafter should keep odor from recurring.
Kosher salt. For extra-sweaty feet, Dr. Levine recommends soaking in a solution of 1/2 cup kosher salt (which is coarser than ordinary table salt) in 1 quart of water.
Aluminum acetate. Try soaking once or twice daily in a solution of cool water and aluminum acetate, which has drying properties, says Dr. Hass. To use, dissolve either 1 packet Domeboro powder or 2 tablespoons Burow's Solution (both available over-the-counter) in 1 pint of water, then soak for 10 to 20 minutes at a time.
Sodium bicarbonate. This makes the foot surface more acidic, thereby cutting down on the amount of odor produced, says Dr. Levine. Dissolve 1 tablespoon baking soda in 1 quart of water. Soak twice a week for about 15 minutes at a time.
Vinegar. Another acid footbath Dr. Levine recommends is 1/2 cup vinegar in 1 quart of water. Soak for 15 minutes twice a week.
Hot and cold water. Alternate hot and cold footbaths, says Dr. Levine. This procedure constricts the blood flow to your feet, reducing perspiration. Then fix yourself a third footbath of ice cubes and lemon juice. Finally, rub your feet with alcohol to cool and dry them. In hot weather, when your feet perspire a lot, you could probably do this every day. Warning: Diabetics and those with impaired circulation should not use this treatment.
Heed sage advice. Europeans sometimes sprinkle the fragrant herb sage into their shoes to control odor, says Dr. Levine. Perhaps a dash of these dry, crumbled leaves will do the trick for you.
(the above taken from: http://www.mothernature.com/library/bookshelf/books/47/64...)