Okay so i did some googling lol
It seems this treatment takes alot longer when it's a plantar wart, but it does work.
So i would try soaking the foot in warm water or ACV for 20ish minutes, then use a pumice stone to gently remove any dead skin.
Put some Vaseline etc around the wart so it protects the skin around the wart & then soak a cotton ball in ACV apply to wart & cover with a band-aid. Replace the cotton ball & band-aid daily.
Do the foot soak/pumice stone every 3-4 days.

Unfortunately it looks like it can take up to 2 months for the plantar wart to drop off but it usually becomes pain free within a couple of weeks