Here’s what you do.
First the labels must be removed from the containers. Soaking in hot water and possibly a bit of dish soap does the trick, sometimes with a bit of scrubbing. More often than not, a lot of glue is left.
Then you mix a little cooking oil (use whatever you have at home) with baking soda, to make a paste.
As long as it will stay put, even a slightly runny paste works well.
Dab the paste onto the glue on the containers and let it sit for a few minutes or so.
Scrub! I prefer to use my fingers, but for really stubborn glue maybe a sponge could come in handy. In most cases the glue comes off quite easily.
When all the glue seems to be removed, wash the containers, by hand or in the dishwasher. You’ll then have completely clean containers without disfiguring glue residues.
I have done this with so many jars, with different kinds of glue, and so far this has worked on everything. I tried it on a plastic tub, and it got light scratch marks from the baking soda, that acts like an abrasive. Nothing too horrid but I’d better mention it.
Do you have any must-know cleaning hacks? Please share, I'm trying to improve and simplify my home making!