8 Things You Absolutely Shouldn’t Wash in the Dishwasher (and Why)

3. Cast iron cookware

Cast iron pans are undisputed kitchen tools, but they don’t stand up to the dishwasher.

Harsh detergents and high temperatures completely remove the polymerized oil layer—known as seasoning—that gives cast iron its natural non-stick properties. Without this protective layer, iron quickly rusts when exposed to moisture and air. Over time, repeated dishwasher washing significantly weakens the iron’s surface.

Here’s how to care for them: Hand wash with warm water and a stiff brush (soap is rarely needed). Dry the pan thoroughly on the stove over low heat, and lightly oil it after each wash to maintain the nonstick coating. Never soak cast iron for extended periods.

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