I know this is going to sound weird, but it works! Go to the store and get a can of Arrid X spray deodorant (not the regular roll on, it has to be the spray). I bought the yellow can. Two or three times a day, spray the bottoms of your feet with it. Within a week, you will see a dramatic improvement! My son had about 20 warts on his feet and within 2 weeks, all of them were gone and they have not ever returned. This tip was passed on to me by my sister who is an RN. I was really skeptical, but willing to try anything to avoid having the poor kid have to get them burned off. I was amazed when it actually worked!
I'm not sure why it works, the only thing I can think of is that it must dry up the oxygen supply to the warts or something like that.