The dishwasher is one of the most convenient appliances in the kitchen. It saves time, reduces the effort of washing dishes, and makes cleaning up after meals much easier. However, not every kitchen item is designed to withstand the high temperatures, strong detergents, and powerful water jets inside a dishwasher.
Putting the wrong items in your machine can damage their finish, dull sharp edges, warp materials, or shorten their lifespan. Before loading your next batch of dishes, take a look at these eight items that are often better washed by hand.
1. Cast-Iron Pans
Cast-iron cookware is known for its durability and excellent heat retention, but the dishwasher can damage its seasoning.
Seasoning is the protective layer of polymerized oil that helps prevent rust and gives a well-maintained pan its natural nonstick properties. Hot water and dishwasher detergent can strip away this layer, leaving the pan vulnerable to rust and making food more likely to stick.
What to do instead: Wash cast iron by hand with warm water and a soft brush or sponge. Dry it thoroughly and apply a very thin layer of cooking oil if needed.
2. Wooden Spoons and Cutting Boards
Wooden utensils and cutting boards can suffer from repeated exposure to heat, moisture, and strong detergents.
Over time, the wood may swell, crack, warp, or develop rough surfaces. Cracks can also make cleaning more difficult.
What to do instead: Wash wooden items by hand using warm water and mild dish soap. Rinse them promptly and allow them to dry completely. Avoid leaving them soaking in water.
3. Sharp Kitchen Knives
High-quality kitchen knives generally benefit from handwashing. Dishwasher cycles can cause blades to knock against other utensils or racks, potentially dulling or damaging their edges.
Harsh detergents and prolonged exposure to moisture can also affect certain blade materials and handles.
What to do instead: Carefully wash knives individually with warm water and mild soap, keeping your fingers away from the blade. Dry them immediately and store them safely.
4. Nonstick Cookware
Nonstick pans are designed to make cooking and cleanup easier, but dishwasher safety depends on the manufacturer's instructions.
Repeated exposure to high heat and detergents may accelerate wear on some nonstick coatings. Certain handles and exterior finishes may also deteriorate over time.
What to do instead: Check the care instructions for your pan. When handwashing is recommended, use a soft sponge and mild dish soap rather than abrasive scrubbers.
5. Fine Crystal and Delicate Glassware
Delicate crystal glasses and decorative glassware may not tolerate the dishwasher well.
High temperatures, sudden temperature changes, and contact with other dishes can cause chips or cracks. Repeated washing may also leave some types of glass cloudy through a process called glass corrosion.
What to do instead: Handwash valuable crystal and delicate glassware using lukewarm water and a gentle detergent. Dry carefully with a soft, lint-free cloth.
6. Insulated Travel Mugs and Thermoses
Some insulated travel mugs and vacuum-insulated bottles are dishwasher-safe, but others are not.
Dishwasher heat and moisture can damage certain seals, lids, exterior finishes, or insulation components. Some products may also trap water between layers or have manufacturer-specific cleaning requirements.
What to do instead: Check the label or manufacturer's instructions before washing. If handwashing is recommended, clean the container with warm, soapy water and pay special attention to the lid and gasket.
7. Aluminum Cookware
Uncoated aluminum pots, pans, and utensils can react with alkaline dishwasher detergents. This may cause discoloration, darkening, or a dull, uneven finish.
Anodized aluminum and coated aluminum cookware may have different care requirements, so the material and manufacturer's instructions matter.
What to do instead: Handwash aluminum items when recommended, using mild dish soap and a nonabrasive sponge. Dry them thoroughly to help maintain their appearance.
8. Items With Labels, Adhesives, or Decorative Finishes
Jars, bottles, cups, and containers with paper labels, glued-on decorations, or delicate painted designs may not be suitable for dishwasher cleaning.
The combination of hot water, detergent, and strong spray can loosen labels, weaken adhesives, or damage decorative finishes. Loose labels may also detach during the cycle.
What to do instead: Remove labels and adhesive residue before reusing suitable containers, and handwash delicate decorative items. Always check whether a container is intended for repeated use and dishwasher cleaning.
How to Know Whether an Item Is Dishwasher-Safe
When you are unsure about a kitchen item, follow these simple guidelines:
Check the manufacturer's instructions: Look for a dishwasher-safe symbol or care label.
Consider the material: Wood, cast iron, delicate glass, and certain metals often require extra care.
Look at the construction: Glued parts, rubber seals, painted finishes, and insulated layers may be vulnerable to heat or moisture.
Use the correct rack: Items approved for dishwasher cleaning should be positioned according to the manufacturer's guidance.
Avoid overcrowding: Dishes and utensils that knock together can become chipped, scratched, or damaged.
Remember that an item being labeled dishwasher-safe does not mean it will remain in perfect condition forever. Repeated cycles can still cause wear, particularly when the wrong detergent or washing program is used.
Final Thoughts
Your dishwasher is excellent for everyday plates, bowls, and many kitchen utensils, but a little extra care can help protect your more delicate and valuable items. Handwashing the right things may save you money by preventing unnecessary damage and extending the life of your cookware.
Before putting an unfamiliar item into the dishwasher, take a moment to check its care instructions.
Which of these eight items have you accidentally put in the dishwasher before? Share your experience in the comments, and let others know which kitchen items you always prefer to wash by hand!