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October 7, 2026

8 items you should never put in the dishwasher

A dishwasher is a time-saving appliance, but certain everyday kitchen items can be seriously damaged by its high temperatures, strong detergents, and powerful water jets. From sharp knives to insulated travel mugs, here are eight categories of items that are better kept out — and the right way to care for each one.

Sharp knives and wooden utensils: water and heat are their worst enemies

Sharp knives lose their edge in the dishwasher. As they tumble against other utensils during a wash cycle, the blades dull progressively — making them less effective and potentially less safe to use. Hand washing with warm, soapy water and drying immediately is the recommended approach.

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