You've come to the right place - Howard has been talking about the anti-fungal qualities of corn meal for many years.
http://www.dirtdoctor.com/Cornmeal-Uses-and-Reports_vq18.htm will take you to a general discussion with links out to more information. Here is the
toenail link. There is no fast way to get rid of toenail fungus, so weather your husband soaks his foot in a slurry of cornmeal several times a week or uses a tea tree product, etc., it easily can take months. Patience is the most important part of the process. My physician offered an Rx for something that would also take time to get rid of it, but it required a blood test to see if my liver was healthy enough for it. No thank you!
I found a bottle of "Blue Goo" Nail Fungus triple relief (with
tea tree oil) (neem) for about $4 at Dollar General (you can find it for about $6 at Amazon) and have been applying that several times a week for about nine months now. I think I'm pretty close to one day having a normal nail. But as I said, anything you use takes a long time.