Dishwashers are fantastic for making cleanup easy, but not everything can go in them. Some items can get ruined or even damage your dishwasher if you’re not careful. Knowing what should be washed by hand is important to keep your stuff in good shape. In this article, I’ll look at 12 things you should never put in the dishwasher.
Cast Iron Pans

These heavy, durable pans need special care. Dishwasher detergents can strip away their seasoning, which gives them their non-stick quality. The high heat and moisture can also cause rust. Always wash cast iron by hand with hot water and a stiff brush. Dry it right away to keep it in good shape.
Sharp Knives
Putting your good knives in the dishwasher can dull the blades. The harsh detergents and high heat can also damage the handles. Knives can also become a safety hazard, potentially hurting someone reaching into the dishwasher. It’s best to wash knives by hand and dry them right away.
Wooden Utensils
Wood doesn’t do well with lots of water and heat. Wooden spoons, cutting boards, and salad bowls can warp, crack, or split in the dishwasher. The detergent can also strip away the wood’s natural oils. Always wash wooden items by hand and let them air dry.
Non-Stick Pans
The high heat and harsh detergents in dishwashers can damage the non-stick coating on pans. Over time, this can cause the coating to peel off, which isn’t safe for cooking. Non-stick pans are easy to clean by hand with mild soap and a soft sponge.
Crystal Glassware
Delicate crystals can easily chip or crack in the dishwasher. The high heat can also cause clouding, making your beautiful glasses look dull. Some detergents can even etch the surface of the glassware. It’s safest to wash them by hand with warm, soapy water and dry with a soft cloth.
Insulated Travel Mugs
Many travel mugs have a vacuum seal between two layers to keep drinks hot or cold. Dishwashing can break this seal, ruining the mug’s insulation. The high heat can also warp plastic parts. It’s best to wash travel mugs by hand to keep them working and looking well.
Aluminum Cookware
Aluminum can discolor and develop a chalky coating when washed in the dishwasher. The harsh detergents can cause pitting in the metal’s surface. This doesn’t just look bad – it can affect how your food cooks. Wash aluminum pots and pans by hand to keep them looking and working their best.
Copper Items
Copper pots, pans, and decorative items can tarnish or discolor in the dishwasher. The high heat and strong detergents can damage the metal’s finish. Copper needs gentle cleaning to maintain its beautiful color and shine. Always wash copper items by hand with mild soap.
Gold-Trimmed Dishes
The gold trim on fancy plates and cups can wear off in the dishwasher. The harsh detergents and high heat can cause the gold to fade or even peel away completely. To keep your unique dishes looking good, wash them by hand with a soft sponge and mild soap.
Certain Plastic Containers
Not all plastic is dishwasher safe. Some containers can warp or melt in high heat. Even plastics that are safe for the dishwasher can still absorb food odors and stains over time. Check for a “dishwasher safe” label, and consider hand washing to make your containers last longer.
Pressure Cooker Lids
The lids of pressure cookers have delicate parts that control steam and pressure. The lids can be damaged in the dishwasher, making the cooker unsafe to use. Strong detergents can also wear down the sealing ring. Always clean pressure cooker lids by hand to keep them working safely.
Vintage or Hand-Painted Items
Old or hand-decorated dishes often can’t handle the harsh dishwasher environment. The paint or glaze can fade, chip, or wash away completely. These unique items need gentle care to preserve their beauty and value. Wash vintage and hand-painted dishes carefully by hand.
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