rubbing alcohol works! It will dissolve solvent based adhesives such as those that 3M (used to?) make. I found that just letting the bare battery sit uncovered prevented my problem. My first audiologist emphasized I needed to do that. She said it “energized” the battery. Whatever the reason, it works.
We used to refer to RM19. It was a good cleaner. Whatever it was, someone used to take it home in quantities somehow and did dry cleaning in his basement. Until he did too much. It was flammable.