There's a ton of natural treatments and OTC things you can try.
The main goal is to irritate the area so that the immune system gets a clue and attacks the wart, which is like a little germ fortress. :) Duct tape does it, ACV does it, banana peel does it--that's why there are so many different remedies. You can use all kinds of things to achieve the same thing.
I have use the OTC bandages on my son's wart. Worked great. Thought I'd try duct tape on mine, before I spent more money. Worked like a charm. Three days and the "root" came out when the tape came off.
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