9 Different Ways To Get Sticky Labels Off Glass Jars Putting jars in an oven for 10 minutes, in a microwave for a few minutes, or blowing them with hot air from a hairdryer heats and melts the glue used to stick labels to glass jars, making it easier to remove the paper label and the glue. 8. A razor blade. You can shave leftover adhesive off using an old razor, a safety razor or a razor blade.