I use the Euro Sheepskin from WalWhore. Only gripe is that sometims you get a bad one and they'll fall apart in the wash. I always let mine air dry. Also, you really need to feel each one, as they are all a little different. Try and get a thick pile one as they work a lot better.
I picked up a Cobra MF mitt for use on my garage queens, I really like it better as it removes dirt a lot better, but its also a bit of a pain if you get something stuck in it while washing (mf holds onto things).