Reduce, recycle, reuse: My problem is that I close to to reuse jar. How do I go and get the cement bad of them? I get some jar that soak in dishwater and the label and...

I get some jar that soak in dishwater and the label and glue slide right past its sell-by date. Some take a bit elbow grease. I'm cool with that. But some come beside a glue that seem to become even stronger the more I soak and the more I scrub. There MUST be some chemical or cleaning solution to get that class of glue rotten. It's especially common on plastic jar. I have also tried soak the gum with chalice cleaner, kitchen cleaner, and have even tried oven cleaner. Please assist. I HATE to throw jars within the landfill.
Answers:    rubbing alcohol works pretty good plus it is cheap.
I bought a product call OOPS!, it works well on most things to remove cement.