Acetone did not work
and you cannot buy Methyl Ethyl Keytone (a horrific carcinogen btw) in California.
I also tried Bestine, rubber cement thinner, and it did not work either.
I even tried that "Tar Off" stuff, whatever it's called, for removing tar and bugs from auto radiators. Ditto.
Thanks, Mark! Just let me know what I owe you for it.