Have you seen the coating GM used on truck frames as far back as 1990? I don't know when they started using it but Simple Green did a great job of making that go away on my '90 Silverado. Oils will dissolve oil-based substances, like glue on various types of tape, waxes, that frame coating- even skin oil will help to remove glue from electrical tape.
I have used WD, but prefer PB Blaster. I used WD until I found out that PB is much faster.
