Getting sticky stuff off paint?

greetings. My ‘64 Dart’s history, someone put on those door guard strips... and didn’t do it very well. They are both screwed on and have the sticky backing. I’ve pulled off one piece (pictured) with Goo Gone and got most of the residue off as well. Before I keep working at it, I thought I’d ask what others do in this situation? Any products or techniques you can suggest?

Thank you
Greg

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