Another vote for Banixx from me. It has worked with ease (spray on, no smell, no irritation for horse) and quickly for my senior horse who recently switched states/stables and got both scratches and rain rot here in PA. It also clears up thrush in hooves. Smartpak sells it, easy cheesy to order. I have also used micro-trek, MTG, sulfur/desitin and betadine–Banixx trumps them all for ease of use and efficacy. I did use Nolvasan (blue solution) washes at the outset to start the Banixx off on a clean slate, but used it only once at the outset, then only banixx afterwards.