I just brush, brush, brush, curry, curry, curry, and alternately use a soft, damp sponge, dry cloth, and scrubby sponge to get her neat. Some days I say the heck with it and let her use her paddock and stall, most of the time I keep the paddock closed to let grass grow this summer. I pour apple cider vinegar into a soft sponge and work it into her legs, belly, and face to keep the flies from biting... she's thin skinned and hates them just crawling on her, though. Also always turn the fan on at noon.
Cowboy Magic and Showsheen is going to be your best friend.