If it's getting repainted anyway you might as well try it. In a pinch I've used lacquer thinner to remove extremely stubborn nastiness. I do NOT recommend doing this on paint you really care about, and do NOT rub too hard. Make sure you wash everything it touches thoroughly. Extremely last resort type of thing.
EDIT - Honestly I'm really surprised the 3M adhesive remover didn't get it. That stuff cuts 99% of the grime I've thrown at it, just have to let it soak in a little before you attack. Are you sure you didn't get the weird California safe formula? They have two versions. The all black can is the one you want.
EDIT - Honestly I'm really surprised the 3M adhesive remover didn't get it. That stuff cuts 99% of the grime I've thrown at it, just have to let it soak in a little before you attack. Are you sure you didn't get the weird California safe formula? They have two versions. The all black can is the one you want.
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