I do know that I had been using Nf in the gelding’s sheaths to soften the crud that they get up in there, prior to washing it out with Excalibur, but somebody on the Horse.com forum, and it may have been that same person, told me that you shouldn’t use it on penile tissue because there had been studies showing that it could cause cancer there or something like that, so I quit doing that. There’s been some good information on that forum from time to time.
Here's what it looks like: Furall Aerosol Powder by Farnam
I used to get Green Soap at the drug store for cleaning out the sheath. Which brings me to a question. Bodie rubs his tail quite a bit and I did notice that his sheath is pretty dirty. Do you think he might be rubbing because he is itchy down there? He has been wormed, so I don’t suspect that is the problem. Gosh, I hate to do that job.