8 Things You Absolutely Should Not Put in a Dishwasher (And Why)

While modern dishwashers are remarkable time-savers, throwing every kitchen utensil or pan into a high-heat wash cycle can cause permanent damage. High-pressure water jets, abrasive detergents, and intense drying heat can strip non-stick coatings, shatter delicate crystal, rust heavy iron, and warp vacuum seals.

Below is an empirical breakdown of items that must stay out of the machine, along with proper hand-washing protocols and dishwasher troubleshooting answers.

The 8 Items to Keep Out of Your Dishwasher

1. High-Carbon & High-End Chef’s Knives

Why: High-pressure water jets knock knife blades against other cutlery, dulling or chipping the delicate edge. Furthermore, harsh detergents corrode fine high-carbon steel, and intense heat causes wooden handles to swell, crack, or separate from the tang.
How to Care: Wash by hand immediately after use with warm, soapy water and a non-abrasive sponge. Dry thoroughly with a towel right away to prevent spot rust.

2. Delicate Crystal and Fine China

Why: The high thermal energy and violent spray action can chip fragile glass or cause micro-fractures. Abrasive detergents etch raw crystal surfaces over time, leaving a permanent, un-polishable cloudy film, while gold or silver leaf trim will strip away completely.
How to Care: Line a basin with a soft towel to prevent slipping. Wash gently using lukewarm water and mild dish soap, then dry with a lint-free microfiber cloth.