Two easy ways: 1. Any food oil like coconut oil or olive oil will break down adhesive residue. Make a paste of oil and baking soda, let sit on the adhesive for a few minutes and then rub with a washcloth until the adhesive is gone. Finish with a quick wash with dish soap. 2. Rubbing alcohol and a rag - with caution! The rubbing alcohol will dissolve sticky residue but can also break down the ink on our printed vinyl decals that you'd find on our Mason Jar Tumblers. Do not soak the jar in rubbing alcohol. Using a washcloth or paper towel, pour a small amount of rubbing alcohol on the cloth and rub over the adhesive until gone. Make sure not to get any on the printed decal.