From making my multi-bean soup, I had to clean the labels off a bunch of jars. I think I found the best way to remove them.
First, just try to peel it off. The labels of 2 of my 7 jars just peeled off in one piece leaving just a little bit of adhesive. If you are lucky enough to have this happen, just rub a little bit of oil on them to get the glue off.
If you’re not quite that lucky, make sure the top shiny layer of paper is mostly peeled off. This will leave the thin white more textured paper. Then you want to put a thin layer of oil on and let it sit for a few minutes. You can use any kind of cooking oil to do this. Be sure you coat the entire outside of the jar otherwise you can just push the adhesive onto other parts of the jar.
When you come back, you should be able to scrub the rest of the label and adhesive off with a dish scrubber. Then you can just wash the oil off.
Just be sure that the inside of your jars are completely dry before you try to store dry beans in them.
Other than storing dried foods in them, what other uses are there for reused glass jars?