Here are 8 things you should never put in the dishwasher, along with the reason why it can damage them or reduce their lifespan:
1. Wooden utensils and cutting boards
Hot water and detergent dry out wood, causing cracks, warping, and splitting. The wood can also lose its protective oils.
2. Nonstick cookware
Dishwashers can break down the nonstick coating over time, making pans less effective and more likely to release flakes.
3. Cast iron pans
They lose their seasoning layer in the dishwasher, leading to rust and ruined nonstick performance.
4. Sharp kitchen knives
High heat and detergent dull the blade quickly and can damage handles. Knives also become unsafe to handle after washing.
5. Crystal and delicate glassware
The heat and pressure can cause clouding, etching, or even cracking, especially in fine crystal.
6. Aluminum cookware
It can react with detergent, leading to discoloration and a dull, chalky finish.
7. Insulated travel mugs
Dishwashers can damage the vacuum seal, reducing their ability to keep drinks hot or cold.
8. Copper items
They tend to lose their shine and develop dark spotting or permanent tarnish in the dishwasher.
If you want, I can also tell you what is safe to put in the dishwasher or how to tell if something is “dishwasher-safe” based on symbols.
