Hi, I dissolved some borax in a canning jar to use in the wash, did not use all of , so the borax made crystals formed on the bottom of the jar. If I had only used an old mayo jar I would just throw it out, but I hate to lose a good wide mouth canning jar. I tried hot water, vingar, and baking soda- each separately - so far nothing has worked. Any chemists out there know what else I can try?