I just commented on a post about this where the guy used dessicated liver tablets to get rid of his warts. Not sure if this would work for plantar warts or not, but I'd think it would help at least!
Anyway, my regimen for getting rid of plantar warts COMPLETELY is
1. Epsom Salt soaks
2. Duct Tape covering the wart 24/7
3. Salicylic Acid pads (the kind that put pressure around the wart/corn pushing it out of the foot and into the acid)
Those are the basics... oh and persistence!
I detailed my experience with getting rid of my deep, stubborn plantar wart completely in just a few weeks using this method and have before and after photos on a blogger page if interested.
stubbornwart (dot) blogspot (dot) com