I have a VERY light palomino, basically white gelding, so I know how you feel. Once the night before a show, he rolled in manure in his stall and it was ALL OVER his belly! ON the same day, he started to grow out his winter coat, so he was a mess. At least it was only an open show. I use shapley's show touch-up- it comes in alot of colors. Also, baby powder. It makes them smell good, too :) Quic-silver is good shampoo. I use a tail bag all spring and winter, and rainy days in fall and summer.