Derby R, Rohal P, Jackson C, et al. Novel treatment of onychomycosis using over-the-counter mentholated ointment: a clinical case series. J Am Board Fam Med. 2011;24(1):69-74.
Very small study (18 patients) of Vicks for fungal toenails. Treated daily for 48 weeks with a 28% fungal cure rate. 85% reported at least some improvement. No other published data
http://www.ncbi.nlm.nih.gov/pubmed/21209346