I've always had excellent luck using plain old Isopropyl Alcohol (Rubbing Alcohol).
By the way, this is the same magic fluid that removes Verdigris on contact. It pays to keep a bottle of this stuff around, even if you don't have to give yourself shots.
Funny, I have never had a bit of trouble cleaning up Dykem with acetone, perchlorethylene, trichloroethane. All are used in various brake cleaner products.