I added some drops of cinnamon oil to a small piece of a cotton ball then covered it with a band-aid. I changed it daily until the wart was gone. This happened years ago so I don't remember how long it took. I do remember though that my brother also had a wart at the time and used some otc medicine and mine cleared up faster.
Be forewarned that some people say that cinnamon oil stings.
HTH,
Jes