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I thought as much! I took my wiper arms off on the 200 a while ago to clean the drains (common issue on Mk3's) and they were tough then, let alone after 15 years.
To remove the polish, I'd just use IPA or something. Black Hole is just a filler/glaze so it won't remove anything, it'll just mask the issues the best it can.
Your best bet is to have the really bad panels painted, then correct the rest of the car with a microfibre cutting pad combo. The...