I actually have a whole bunch of other random stuff that's glued onto the heatsink:
2x GeForce 4 Ti 4600's (with 2 replacement heatsink/fans I ordered months ago)
2x Pentium classics, from my old computer in the 90s. I actually let one soak in 70% Alcohol for awhile and it did nothing.
Epoxy is a thermosetting plastic. It is resistant almost all solvents. Methylene chloride mearly softens the surfaces and areas of incomplete polymerization. I went to glue school, or was school on glue?