Many household items can be damaged by the heat, water pressure, or detergent used in a dishwasher. Here are 8 things that are commonly best kept out of the dishwasher:
🔪 1. Sharp kitchen knives
Why:
- Dishwasher cycles can dull the blade.
- Knives may bang against other items.
- Moisture can contribute to corrosion on some knives.
🪵 2. Wooden utensils and cutting boards
Why:
- Wood absorbs water.
- Repeated soaking and drying can cause warping, cracking, or splitting.
🍳 3. Cast iron cookware
Why:
- Dishwasher detergent can strip the seasoning.
- The pan may rust.
🥄 4. Fine silver or silver-plated items
Why:
- Harsh detergents can cause tarnishing and discoloration.
- Contact with certain metals can accelerate damage.
🥤 5. Insulated travel mugs and vacuum bottles
Why:
- Water can sometimes damage the vacuum seal.
- Performance may be reduced over time if the manufacturer does not label them dishwasher-safe.
🧴 6. Items with glued-on parts or labels
Why:
- Heat and moisture can weaken adhesives.
- Labels may peel off and clog dishwasher filters.
🍽️ 7. Delicate crystal or hand-painted dishes
Why:
- High heat and strong detergents can cause clouding, fading, or cracking.
🥣 8. Nonstick cookware (unless labeled dishwasher-safe)
Why:
- Repeated dishwasher use may shorten the life of the nonstick coating.
- Hand washing is often recommended by manufacturers.
⚠️ Bonus items often worth checking
- Aluminum cookware (can discolor)
- Copper cookware (can tarnish)
- Certain plastics not marked dishwasher-safe
- Fine china with metallic trim
🧠 Best rule of thumb
Before putting an item in the dishwasher, check the manufacturer’s care instructions. Many modern products are dishwasher-safe, but items made of wood, cast iron, delicate metals, or fine decorative finishes are usually better washed by hand.
