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Source: Photo by Benneta Bar Gears/YouTube

Recently Discovered Video Shows How To Tell If Your Beer Glass Is Actually Clean

By Mike Walsh

A video designed for bartenders has gone viral: it reveals how to tell if your glass is actually clean or just looks like it's clean.

The secret to telling whether or not detergent, oil, grease, or other residue is still taking up residence in your glass is fairly simple.  The answer is: salt.