[header] How to rid your horse of mud fever [title] Clean your horse's legs regularly. [step] Look at your horse's legs every day for any signs of irritation or scabbing. If you notice irritated skin or scabs, clean the legs with a good quality soap, like a chlorhexidine scrub preparation. 
Rinse your horse's legs and apply enough of the chlorhexidine to cover the area. Gently wash the legs and rinse off the cleanser.