There are a couple products I have used in the past with success. One is called MTG sulfur is the active ingredient but if you have a horse with pink skin it will cause them to burn because of the oil in it. Another product is Nu-stock I also has sulfur in it but is more of a cream then a liquid and less messy then MTG. Or what I do is by cheap diaper cream, powdered sulfur and mix it myself. I would first wash it good with an anti-fungal shampoo dry it good then apply the other product. The MTG, nu-stock and even my homemade stuff will stay on a couple of days as long as you don't wash it off. Hope this helps.