Selenium is a touchy mineral, and the body needs just the right amount of it. Some people live in Se-rich parts of the country (like Wyoming) and have levels that are too high. A severe excess (selenosis) will cause a garlic odor on the breath, but I've never heard of feet. It also causes balding, but it's reversible. I don't know how long it takes the body to clear it. I just remember some things from doing some personal research some years ago.
I'm not sure that it does clear the body. Some of the elements accumulate and don't clear. Now I come to think of it, I think I also absorbed arsenic and tellurium at that time.
Eating fish in the San Juaquin Delta will probably do the trick too. They have a big problem with Selenium coming out of the rice fields.