My horse has a case of mud fever on his back 2 legs. I've been using Cowboy Magic Krudbuster to clean and soften the scabs, and then rinsing it, letting his feet dry, and covering with Corona Ointment. He is pasture boarded and unfortunately, I have no way to get him a stall. This is going on day 6 now. It's not getting much worse, but it's also not getting better. Any other ideas?