The little vial I test my salt with has black stains that I would love to get rid of. I can barely make out the 10ml which I need to be able to see. Picture: http://i77.photobucket.com/albums/j4...pse0157b5d.jpg
Normal soap like ivory doesn't cut it, and I put it in the dishwasher (top shelf) and even the dishwasher didn't put a dent in the black stains.
Suggestions on how to remove? Maybe muriatic acid on a q-tip would work?
Thank you in advance.