What causes white spots on glassware or silverware?
“Hard” water, which contains more minerals than “soft” water, can cause spots on glasses or silverware. It is best to read the owner’s manual for your dishwasher and follow the manufacturer’s recommendations regarding hard water. Some other tips that may help reduce spotting include using hotter water, varying the brand and type of rinse agent and detergent, and adding white vinegar to the rinse cycle of the dishwasher.
