Whether you're breaking in a new dishwasher or you're a veteran of automated cleaning, the urge to cram everything inside and hit start is real.

Hold up before you toss every utensil and blade onto those racks. Those scorching temperatures and intense wash cycles can wreak havoc on your best kitchen gear. Think warping, rust, cracks, and dull edges -- even items marked "dishwasher-safe" aren't immune. Yes, that means some of your most expensive tools are at risk too.

So before you run that next cycle, double-check what you're tossing in. Your chef's knives , skillets and stemware will thank you.

12 things that should never go in the dishwasher

1. Insulated mugs

Insulated mugs can be damaged by the pressure from a dishwasher. The Darling Effect

The high hea

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