Many kitchen items are labeled “dishwasher safe,” but some things can still be damaged by the heat, strong detergents, or powerful water jets. Here are 18 things you should usually avoid putting in the dishwasher:
- Wooden cutting boards
- Heat and long exposure to water can cause warping, cracking, and splitting.
- Wooden spoons and utensils
- They can dry out, crack, or lose their finish.
- Cast iron cookware
- The dishwasher can remove the seasoning and lead to rust.
- Carbon steel knives or pans
- They can rust and lose their protective surface.
- High-quality kitchen knives
- Dishwasher cycles can dull blades and damage handles.
- Nonstick pans (unless specifically labeled dishwasher safe)
- Heat and detergents may shorten the life of the coating.
- Copper cookware
- Detergents can discolor and dull the copper surface.
- Aluminum cookware
- It may become gray, cloudy, or stained.
- Crystal glassware
- Heat and detergent can cause cloudiness or cracks.
- Delicate wine glasses
- Thin stems and fragile glass can break from vibration.
- Insulated travel mugs and cups
- Dishwasher heat may damage the vacuum seal.
- Pressure cooker lids and sealing rings
- Small parts can be damaged or not cleaned properly; check the manufacturer’s instructions.
- Graters and fine mesh strainers
- Food particles can get trapped, and sharp edges may damage the dishwasher racks.
- Hand-painted dishes or ceramics
- Decorative finishes can fade or peel.
- Antique dishes
- Older glazes and materials may not tolerate dishwasher detergents.
- Kitchen gadgets with glued parts
- Heat and water can weaken adhesives.
- Wood-handled tools or knives
- Handles may swell, loosen, or crack.
- Anything with electrical components
- Items like electric can openers, immersion blender motors, or battery-powered tools should never go in the dishwasher.
Tip: When unsure, look for a dishwasher-safe symbol or check the manufacturer’s instructions. The top rack is often gentler, but it does not make every item dishwasher-safe.
