i don't really like kids in glass houses that much to be honest.

Whoever made the original glue for these labels knew what they were doing! :-) Removing the back paper labels is tougher than removing the front labels. GooGone and WD-40 - usually sure fire treatment for sticky labels did not work well. The best way to remove torn or partially missing paper labels is to soak them in warm or hot water. If you can get one edge up, run warm/hot water under that edge and repeat until the entire label is wet. Once the label is completely saturated, you can gently scrape it off using a dull implement. Start at the top edge, and scrape under the label from side to side, across the top. Then , continue scraping under the label moving slowly underneath, from side to side until the entire label is free from the jar. If you want to preserve the label, gently pick it up and lay it out flat to dry. The paper behaves like hand-made paper when it is wet so, lay it out on a clean, flat surface, smooth out the wrinkles, mend the tears, flatten with your finger. The label will be intact after it dries. Clean the remainder of the glue off the jar using warm, soapy water and a scrubby or plastic sanding sponge, not a metal scrubber!