No wash rack? No problem. Equiderma's Daily Defense Dry Shampoo refreshes a dirty, sweaty horse (or rider) and fights bacteria and fungus at the same time. The non-toxic, talc-free formula cleanses and dries your horse while battling skin conditions like rain rot and sweet itch. Made from a superior blend of nature's finest ingredients. Simply sprinkle on, massage in, and fight grime, sweat, fungus, bacteria and more for a fresh, pleasant scent! 
Product Details:

Dry shampoo cleans and dries your horse without water
Can be applied directly onto skin/hair or apply to towel or brush then rub/massage in
Ingredients fight fungus and bacteria that cause skin ailments
Can be used on horses, humans, and equipment
To freshen boots, saddle pads, helmets, or any other equipment, apply generously and leave out in the sun or fresh air to dry