FWIW, I wash my skins so I can stand to have them in the closet in the house. The smell is overwhelming when you mix mud, grease, black powder residue, and lord knows what else on pants after a weekend of fun. If you put them in a dryer, on cold, and throw in a couple of sneakers that are clean, after washing the skins, they will come out soft, and smelling much better. If you don't have sneakers, a couple of tennis balls or handballs will work just as well. The balls or shoes beat the leather as it is drying, along with the normal bar beaters in the machine. It works really well. I know a trapper who used fabric softener, in water to soak a fox pelt, to " tan" it, and then dried it in his machine dryer, first putting the pelt in a knit bag, and then throwing in some tennis balls. When it came out, the skin was soft and pliable. and the fur was undamaged.
I washed my skins in the bath tub, using a cold water detergent, and then hung them up in the bathtub to drip dry. They came out stiff, but I rubbed them over the back of a chair, and it only took a few strokes to soften the elkskin again. Now that I don't have a domestic supervisor, I can simply put them in my dryer!