When I was in college (back when dinosaurs roamed the earth), we used acetone in the killing jar.
You can still get acetone-based nail polish remover if you shop carefully. I know this because I recently had to do a lot of repair work with gap-filling spray foam insulation, and acetone is the easiest way to clean up messes from that. But if ethyl-acetate-based nail polish remover works just as well in killing jars, you don’t need to go to the trouble.