Removing copper tape

I took down my 27m SSD layout and I'm left with copper tape all over the rails! I figured I'd just lift it off before I took up the track, but that was a total failure. Now I have all this track with various amounts of tape on the rails.

I've tried picking it off with an #11 blade(EXACT) with little luck. I'm afraid to ruin the track with a solvent, but maybe there is something mild enough?

Any suggestions would be appreciated!!

Thanks in advance,