My MIL had it for years, we told her about Whitfield's ointment and it cleared it up for her. Not sure if you can get it any more, it is salicylic acid in a petroleum base. Ask your druggist.
That being said, we now use Nizoral, a prescription cream that works great.
DH and I are both going to try the Vick's on toenail fungus, if we can ever remember to buy some!