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I've been using Purple Power on the engine bay and front suspension, and it's worked great. First, I used a putty knife for the heavy stuff; then after a few applications of the purple Power, most of the surfaces were getting down to bare metal (and even original paint in some cases). I used an old tooth brush on some of the tight spots.
I have always found brake fluid to be a very good cleaner, been using it for 30 plus years. 
