
The convenience of dishwashers has revolutionized kitchen cleanup, but not everything belongs in these handy appliances. Using a dishwasher to clean certain items can result in damage to the items, the dishwasher, or both. Here are 15 things you should never put in the dishwasher and why hand washing them is a better option.
Wooden Utensils

Wooden items, such as cutting boards, spoons, and salad bowls, should never be placed in the dishwasher. The heat and moisture can cause the wood to crack, warp, and eventually split. Additionally, the detergent can strip the wood of its natural oils, leading to a dry and brittle texture. Always hand wash wooden items with mild soap and warm water, then dry them thoroughly to maintain their integrity.
Nonstick Pans

Nonstick cookware can be damaged by the high heat and harsh detergents used in dishwashers. Over time, this can cause the nonstick coating to deteriorate, making the pans less effective and potentially unsafe to use. Hand wash nonstick pans with a soft sponge and mild detergent to prolong their lifespan.
Cast Iron Cookware

Cast iron skillets and pans are cherished for their ability to retain heat and add a unique flavor to foods. However, they require special care. The dishwasher’s harsh detergents and high temperatures can strip away the seasoning, causing the cast iron to rust and lose its non-stick properties. Always hand wash cast iron with minimal soap and dry it thoroughly to maintain its seasoning.
Insulated Mugs and Tumblers

Insulated mugs and tumblers have a vacuum seal that can be compromised by the high heat of the dishwasher. This can cause the insulation to fail, making the mugs less effective at keeping drinks hot or cold. Always check the manufacturer’s instructions, but generally, hand washing is recommended.
Kitchen Knives

Dishwashing can be detrimental to kitchen knives, causing them to become dull more quickly. The high heat and harsh detergents can damage the handle, and the movement of the dishwasher can cause the blades to nick or bend. Always hand wash knives immediately after use and dry them thoroughly to keep them sharp and in good condition.
Crystal Glassware

Crystal is delicate and can easily chip or crack in the dishwasher. The high heat can also cause the lead in some crystal glassware to leach out, posing a health risk. Hand wash crystal items with warm water and a gentle dish soap, and dry them with a soft cloth.
Pressure Cooker Lids

Pressure cooker lids contain seals and valves that can be damaged by the dishwasher’s heat and detergents. These parts are crucial for the pressure cooker’s functionality and safety. Hand wash the lids and check the manufacturer’s guidelines for proper maintenance.
Copper Pans and Utensils

Copper cookware and utensils are prized for their excellent heat conductivity and beautiful appearance. However, dishwashers can dull the finish and cause pitting or corrosion. Hand wash copper items with a gentle dish soap and a soft sponge to maintain their shine and performance.
Acrylic and Melamine Dishes

Acrylic and melamine dishes are popular for their durability and vibrant colors. However, the high temperatures in dishwashers can cause them to warp or crack. Additionally, the detergent can cause the colors to fade over time. Hand wash these items to preserve their appearance and functionality.
Aluminium Cookware

Aluminium can react with dishwasher detergent, causing it to discolor and become dull. It can also leave a residue on other dishes in the dishwasher. To avoid this, hand wash aluminium pots, pans, and utensils with warm water and mild soap.
Gold-Plated Dishes

Gold-plated dishware can lose its luster and even have the gold trim wear away in the harsh conditions of a dishwasher. The high heat and abrasive detergents can strip away the gold layer, leaving the dishware looking dull and worn. Hand wash these items with a gentle detergent to preserve their beauty.
Milk Glass

Milk glass, a type of opaque white glass, can become discolored or develop a cloudy appearance after repeated exposure to the dishwasher’s high temperatures. To keep milk glass looking its best, hand wash it with mild detergent and warm water.
Cheese Graters

Cheese graters should not be put in the dishwasher because the small, sharp blades can be dulled by the high heat and harsh detergents, reducing their effectiveness. Additionally, food particles can become lodged in the tiny holes, and the dishwasher may not be able to fully clean these residues, leading to hygiene concerns. Hand washing cheese graters with a brush ensures they remain sharp and thoroughly clean, preserving their functionality and longevity.
Silicone Bakeware

While some silicone bakeware is labeled as dishwasher safe, frequent exposure to high heat and detergent can cause the silicone to degrade over time. To extend the life of your silicone baking mats and molds, hand wash them with warm water and mild soap.
Fine China

Fine china should not be put in the dishwasher because the high heat and powerful water jets can cause it to chip, crack, or break. On top of that, the harsh detergents can erode delicate patterns, gold rims, or hand-painted designs, diminishing their beauty and value. To preserve the integrity and appearance of fine china, it’s best to hand wash each piece with mild soap and warm water.