Old-School Alarm Question: How Do You Remove Foil Tape From Windows?

A friend bought a house which still has the old foil tape on the windows for the alarm system. They've been scraping it off with a razor blade and trying to use Goo Gone to remove residue, but they're still ended up with lines and goop where the tape was installed. I'll try and get actual pictures, but for those unfamiliar, foil tape was a thin metal tape applied to windows to detect breakage, like below (more decorative than most installs):

I know we have some old school alarm installers here. Anyone have any experience with it?

Incidentally, I have a house which had tape on some top windows as well, and it came right off without these issues, so not sure the difference in these installations.

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