The white residue left on your otherwise clean dishes is most likely caused by hard water. The water evaporates as your dishes dry, but minerals like calcium and magnesium are left behind. This causes the white spots to appear on your dishes. You could use white vinegar or citric acid to remove the hard water stains, but that is just a temporary solution. Hard water is often a recurring issue. Another option, that could solve the problem permanently, is to invest in a hard water softener.
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