I would use it on the black stuff on the hood and also try it on the adhesive residue in your interior. You asked about taking care of your paint, and I have a regimen I like to use that has made 38-year-old paint get smooth and look good. Not new, but good for its age. I gave a rundown on the #2 post in this thread:
https://67-72chevytrucks.com/vboard/...d.php?t=819383
It would be cool to see the results as you get the stuff cleaned off your paint and start to bring it back to a shine.