I do the whole warm towel treatment on the nicer afternoons. Or just a dry towel with
THIS awesome stuff (but TJ hates the smell

??). I also like the Cowboy Magic Green Spot Remover, which also has herbal extracts and Shea butter. And brush, brush, brush!
For anyone else w/a horse w/feathers, I use MTG religiously during the wet months. It keeps them clear from scratches et cetera, and leaves an oily slick behind to help w/ keeping mud and ice off. You could also try baby oil, but I don't find it leaves enough slip.