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Dishwashers are excellent for everyday plates, glasses, cutlery, and many modern kitchen tools, but they are not always the safest option for delicate or valuable items.
Sharp knives, wooden utensils, crystal, fine china, cast iron, some nonstick pans, labeled containers, insulated bottles, copper cookware, and antique porcelain are often better washed by hand.
When in doubt, the safest choice is simple: follow the manufacturer’s cleaning instructions.