I had great success with castor oil and baking soda. I believe it is an old Edgar Cayce remedy? You add enough castor oil to baking soda so that it makes a thick paste (to where you can roll it into a little ball like gum) and put it on the wart. Cover with bandaid. It took me probably a month or so for it to work, but I was not religious about appplying it every day. Sometimes I would forget for a few days.
About the last week (when I could see that it seemed to be dying) I got serious and applied it every day. I think if I had applied it around the clock (instead of just for 8 or 12 hours) it would have disappeared much quicker. I had had that wart for about 10 years (between my toes). I had tried just about everything- over the counter and a foot doctor. I thought that wart and I were going to grow old and die together! After 10 years I was so thrilled to finally be rid of it!
As a teenager I had five "seed" warts on my right middle finger. They drove me nuts for a about three years until my mother suggested I use castor oil. I would soak small pieces of of a cotton ball in the castor and then place it on the wart held on with surgical tape. After about three weeks of this all of my warts had disolved. There was no scar and the surrounding skin was not effected. I hear that castor oil is also good for longer, thicker eye lashes.
A foot doctor said to put cold-pressed castor oil on a large wart on my sons' toe then put a sock on his foot nightly til the wart goes away. Amazing but it did within a week.