The damage: The seasoning will be stripped away, leaving the pan vulnerable to rust and sticking. The high heat can also cause cracking or warping.
What to do instead: Wash cast iron by hand with warm water and a stiff brush (use a small amount of mild dish soap if needed, but avoid harsh detergents). Dry immediately and rub with a thin layer of oil to maintain the seasoning.
Pro tip: For stuck-on food, scrub with coarse salt and a paper towel, then rinse and dry.
3. Fine China and Crystal (Etches and Chips)
Why it’s bad: The high heat and harsh detergents can etch (chemically eat away) the glaze and any metallic accents (gold, platinum, silver). The intense water pressure and jostling can cause chipping and cracking.
The damage: Faded patterns, cloudy film, rough texture, and chips or cracks.
What to do instead: Wash fine china and crystal by hand with warm, soapy water and a soft cloth. Rinse with cool water. Dry immediately with a soft, lint-free towel.
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