This topic was just on the show "The Doctors" and here is what they told one lady to do.
"Heidi, 36, is embarrassed by her foot odor, which she says smells like a horrible mixture of rotten eggs and nacho cheese. Dr. Sears performs a smell test and agrees that her feet are indeed pretty stinky. He explains that foot odor is caused by bacteria and suggests that Heidi soak her feet in a tub of black tea for 30 minutes every day for a week. The tannic acid in the tea kills bacteria and closes the sweat pores in the foot. To demonstrate, Dr. Sears sets up a soak for her, and by the end of the show, Heidi notices a marked improvement and kicks up her heels!"
They also said that after the first week she could cut back and may get to the point of doing it once a week.
I was one of those kids with stinky feet and wished I would of known about this.