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No HTwo O, thanks for the Bumperplugs recommendation, I'll go with them.
Glad this worked out for you. Eric and Bumperplugs have great products & customer service, fair pricing, and contribute a lot to the Porsche community and here at Rennlist.
You got me. I have used lighter fluid (Naptha) on some of the stubborn stuff though.
The best stuff for all around removal of crud is a chemical used in body shops - wax and grease remover. PPG's is DX330, Sherwin-Williams' is called Sher-Will-Clean. It is used as a final wipedown before paint is applied. It isn't as harsh on paints as I would assume stuff like acetone or butane is. In my experience, it does work better at removing tire rubber than WD40. It will absolutely remove the wax, so if you have to use it, you'll have to rewax the car.
I'm surprised to see the mention of Zainos here. I bought some of that for my first new car (14 years ago), and I found that it certainly made things look better than other waxes, but it was very lacking in durability. I still have unfinished bottles of teh polish and wax.