After every wash I rinse my sheepskin mitts out in the bucket, then take it inside, rinse it out with warm water, squirt a few squirts of dawn and lather it into the mitt. Then, using warm water, rinse out the mitt and watch all of the dirty crud wash out.
The first time I did this, I washed the mitt I had used that day then got the mitts I used awhile ago without rinsing and washed them with dawn and those "clean" mitts I thought I had got a lot fluffier and the dirty water was running out.
After squeegying (sp?) them with my fingers after washing, I shake them in the sink and all of the little hairs "stand up" and it helps them dry easier. I just set them on towels to dry and turn them ever so often until dry.
Hope this helps.