Is there any OTC cure for toe nail fungus?

Several treatments. The reason you hear so many different treatments for toenail fungus is because there is no perfect, sure-fire treatment that works 100% of the time. I've seen vaporub work, as well as other natural oil remedies, but rarely. You can also try laser therapy, antifungal creams, paints, or even oral medications if your doctor deems you healthy enough to take them.
Variety of options . Topical or oral medication can help. Visit a local podiatrist for further evaluation and treatment. Importance of prevention is big as well. Antifungal powders, sprays & changing socks are important.