Why it’s bad: The high heat and harsh detergents can dull the blade. The jostling against other items can nick and damage the edge. Over time, your once-sharp knives become dull, difficult to use, and potentially dangerous.
The damage: Dull knives require more pressure to cut, increasing the risk of slipping and causing injury. The blade’s edge can also become pitted or corroded.
What to do instead: Wash sharp knives by hand with warm, soapy water. Dry immediately with a soft cloth. Never leave them soaking in water (which can damage the handle and dull the blade).
Pro tip: Store knives in a wooden block or on a magnetic strip, not loose in a drawer where they can knock against each other.
2. Cast Iron Cookware (Destroys the Seasoning)
Why it’s bad: Cast iron requires a layer of seasoning (polymerized oil) to create a non-stick surface and prevent rust. Dishwasher detergents are designed to strip away grease and oil—exactly what you don’t want on your cast iron.
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