I frequently reuse pickle jars for other purposes (normally it's picking other things; I made pickled beets last night). I've been using the "scrape with my fingernails, wash in hot water" method, which is a lot of work. This way is a lot easier: Rub a little oil on the label. Soak the oiled jar with warm water (inside and out). Leave it there overnight. Remove the label using a scouring sponge if needed. Here are the details if you want to learn more: https://food52.com/blog/19134-the-laziest-way-to-get-a-sticker-off-a-jar-is-also-the-most-effective I can confirm that it works...even better than advertised! I decided to try this with a Chinkiang vinegar label, which has always seemed like it's fused to the glass. I applied oil, immersed the bottle in warm water (inside and out), and expected that I'd have to wait until the next day. But, an hour later, the label had slipped off the bottle on its own!