While dishwashers are convenient and effective for cleaning many items, there are certain things you should avoid washing in a dishwasher to prevent damage or potential hazards. Here are some items you should never wash in a dishwasher and the reasons why:
Cast iron cookware: Dishwashers can strip away the seasoning and cause rusting in cast iron pans. Hand washing with gentle soap and proper seasoning maintenance is best for preserving their non-stick properties.
Nonstick cookware: The harsh detergents and high water temperatures in dishwashers can degrade the nonstick coating on pans and pots, reducing their effectiveness and lifespan.
Wooden items: Wood can warp, crack, or lose its finish when exposed to the high heat and moisture inside a dishwasher. Wooden cutting boards, utensils, and handles should be hand washed and dried promptly.
Fine china or delicate glassware: Delicate items can chip, crack, or get damaged in the dishwasher due to the high-pressure water and the jostling that occurs during the wash cycle. Hand washing is safer for preserving these items.
Copper or brass items: The high heat and harsh detergents can tarnish and discolor copper and brass, so it's best to hand wash and dry them carefully.
Insulated mugs or containers: Dishwashers can compromise the insulation of these items, reducing their ability to keep beverages hot or cold.
Kitchen knives: The dishwasher's intense water pressure and high temperatures can damage the blade's edge and handle over time. Hand washing and immediate drying are recommended for knives.
Aluminum items: Aluminum can react with the dishwasher detergent and become discolored or develop a chalky residue. Hand washing is a better option for aluminum.
Plastic containers not labeled as dishwasher-safe: Some plastics may not withstand the high heat in dishwashers and can warp or release harmful chemicals. Always check the container's label before placing it in the dishwasher.
Some dishwasher-safe items with decals or painted designs: Over time, the harsh dishwasher conditions can fade or damage the decals and painted designs on certain items.
Always refer to the manufacturer's instructions and guidelines for your dishwasher and specific items to ensure safe and proper cleaning. When in doubt, hand washing is usually a safer option to preserve the quality and longevity of your belongings.