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Did you try the hair dryer or heat gun as suggested? Never tried this 3M Automotive 8987 - General Purpose Adhesive Cleaner but it seems like the right product.
It's called Betalink, and its a hell of a glue. Everything I've read says that it has to be "mechanically removed" i.e. sanded or ground off. BMW has a solvent that comes with the kit (82699408866KT) but its for cleaning up freshly applied glue, not sure it would work on dried glue.
You need to use a heat gun, not a hair dryer, it doesnt get hot enough.
He's what I did when I worked at my buddies vinyl shop with this
1 - Spray 3m adhesive remover on the black stuff and let it soak in.
2 - Spray it again, let it soak
3 - Spray it again and now add heat. Start at the low setting of the heat gun
4 - Get a vinyl scraper and you will be able to scrap that stuff off because the heat and the adhesive remover will be breaking down that stuff
5 - When its all off, spray it with the remover again and wipe with a rag.
6 - Use a scratch remover compound to get rid of the scratches, polish next, finally wax
Since its off, just do step 6 to get rid of the scratches on the paint