8 Things You Should Never Put in the Dishwasher (and Why)
While dishwashers are convenient, some items can be damaged by high heat, strong detergents, or powerful water jets. Here are common things that are better washed by hand:
- Cast iron cookware
- Dishwasher detergent and prolonged water exposure can remove the seasoning layer, causing rust and making the pan less nonstick.
- Wooden utensils and cutting boards
- Heat and moisture can cause wood to warp, crack, split, or lose its protective finish.
- Sharp knives
- Dishwasher cycles can dull blades over time, and the movement inside the machine may damage handles or coatings.
- Nonstick pans
- Harsh detergents and high temperatures can wear down the nonstick coating, shortening the pan’s lifespan.
- Crystal glassware
- Hot water and strong detergents may cause cloudiness, scratches, or even cracks in delicate crystal.
- Copper cookware
- Dishwasher chemicals can discolor copper and remove its shine or protective finish.
- Insulated mugs and bottles
- The heat and water pressure can damage seals, insulation layers, or vacuum components, reducing their ability to keep drinks hot or cold.
- Hand-painted, antique, or delicate dishes
- Decorative finishes, gold or silver trim, and older materials may fade, peel, or become damaged.
Tip: Always check the manufacturer’s care instructions. Some modern versions of traditionally “hand-wash only” items are dishwasher-safe, while others are not. When in doubt, gentle hand washing is usually the safer choice.
