18 Things You Should Never Put in the Dishwasher (Even If You’re Tempted)

9. Insulated Travel Mugs

Unless the manufacturer specifically says they’re dishwasher-safe, washing them in the dishwasher can damage the vacuum seal.

10. Aluminum Cookware

Some aluminum items can become discolored or develop a dull finish after repeated dishwasher cycles.

11. Cheese Graters

Tiny food particles often remain trapped in the blades, making hand washing a more effective cleaning method.

12. Garlic Presses

The small holes can trap food residue, and many models require manual scrubbing to clean thoroughly.