I had a plantars wart many, many years ago on my hand. Nothing was getting rid if it until someone told me to crush some aspirin and put the powder on it. If you can double check this on the internet or with a Dr. that would be a good idea. I am pretty confident it was aspirin, I know it was white and powdery once I crushed it. I kept it on with a bandaid. Anyway, it didn't take long before it started to heal. It got all dried up and looked sort of like ugly cauliflower. Eventually, the pieces were driy enough to fall off or be pulled off.
I know this sounds disgusting - and it was. But it was on my hand and very painful. It might be worth a try.