I have several horses, like 7 big ones, 5 minis and 3 donkeys that are going to have to be treated for rain rot. My big horses have it really bad. I did some research and found several things but wanted your opinion on what you used that worked. Since I have so many that have to be treated I need something economical. I found that some people used listerine, watered down bleach, and one that I thought was pretty interesting, it said use Apple Cider Vinegar. Said it got rid of it in 4 days??? Has anyone tried this?