Oh, the promise a plastic glass labeled "top rack dishwasher-safe" holds! Carefree kitchens with drinkware that's not only unbreakable, but dishwasher-friendly. But anyone with a dishwasher less than ten years old may hold a different view. Their "top rack dishwasher-safe" tumblers often come out of the top rack crackled, scaly or clouded - sometimes...
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