I am working on a house that was painted 2 - 3 years ago. They put regular masking tape on the aluminum windows (outside) before painting, but never removed the tape. I have tried "Oops" and "Goo Gone" to get the tape and crud off. I have most of the tape off, but some is still on there, and there remains the yellowish tape 'glue' afterwards. A neighbor gave me some Dylene (not sure of the spelling or exact name), but that didn't work any better. Any ideas?

masking tape