do you know what kind of glue? If you have the bottle, try contacting the manufacturer. Oxy clean (or the generic oxygen clean) may help in softening it. Scrub a bit with an old toothbrush. Shout! may also work. Again...scrub with a toothbrush. Make sure scrubbing is in a small circle just to make sure you don't move the glue from one part of your jeans to another.