I think if you soak that in water the discoloring will diminish very slightly. It won't hurt anything, give it an overnight try...
What would cause some of that old tape adhesive to dissolve and release a bit would be a non-polar solvent. Back up there 105 degrees is mentioned as the angle on the hydrogen atoms. I think 107 to 107.5 is closer to correct. 107 is what I'd recalled from years ago... Anyway, that angle puts water in as a polar solvent. Lighter fluid would be non-polar. It would dissolve that tape residue a bit, but not completely. It would also leave its own residue, and a smell. I don't advocate its use. Carbon tet, which was available when I was a kid, was a good non-polar solvent, too good... it isn't readily available now.
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