That was the day I realized that “dishwasher-safe” doesn’t mean “dishwasher-safe for everything.” Some items simply cannot withstand the high heat, harsh detergents, and intense water pressure. And putting them in the dishwasher doesn’t just ruin the item—it can also damage your appliance or, worse, create safety hazards.
Protect your kitchen investments—from sharp knives to heirloom china—with these expert-backed rules.
Here are 8 things you should absolutely never put in your dishwasher.
1. Sharp Knives (Ruins the Blade)
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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.
