What about that Purple Power degreaser? I used that stuff to clean off the funk around the inside of my gas cap compartment, and also around the inside lip of the trunk lid. Apparently gas can build up gunk around the cap, and sometimes moisture doesn't drain properly from around the inside of the trunk lid - leaves a nasty black residue. UCK!

I hear Mustangs are even worse...

At any rate, that Purple Power stuff was pretty toxic. Would Purple Power work for those areas too? Or is Simple Green more effective?