Aluminum chloride hexahydrate
"15 plantars warts for son so bad and deep one podiatrist wouldn't treat him.  Referred to another.  Laser surgery is only option to keep normal life, but told to use Drysol for 2 weeks first.  Off script, as directed put on each a.m. once a day only.  Wow!!! After48 hrs they started to turn black and discomfort gone. After 2 wks they are more dry and black... we are waiting to hear back from podiatrist to see next step.  Surgery may not be needed after all. No side effects."