I,m a kerosene guy, seems to work quickest on real old crap. I have used brake cleaner and it is super quick and powerful but really dangerous to the body. I use it sparingly and as a last resort. But when time is an issue I will carefully use it. And yes I use kerosene because I do have a place to dispose. The brake cleaner evaporates on its own but I assume at a cost to the environment.