Your dishwasher is a real time-saver, but it isn’t designed for every kitchen item. The combination of very hot water, strong detergent, and powerful spray jets can wear down materials quickly, sometimes ruining them after only a few washes. Knowing what to keep out of the dishwasher protects your cookware, keeps it looking better longer, and saves money over time.
Sharp knives should always be hand-washed because dishwasher jets can dull the blade and detergent may corrode the metal. Cast iron is another big “no,” since the dishwasher strips away the protective seasoning and can cause rust. Wooden cutting boards, spoons, and bowls also suffer in high heat and moisture, leading to warping, cracking, and possible long-term damage.
Nonstick pans are best washed by hand because harsh detergents slowly break down the coating and can cause it to peel. Insulated drinkware like tumblers and thermoses can lose their vacuum seal, while gaskets and lids often trap grime. Aluminum and copper cookware should also stay out of the dishwasher, as detergent reactions can cause discoloration, pitting, and loss of shine.
Delicate dishware deserves special care too. Fine china with metallic rims can fade or crack, and crystal or hand-blown glass can become cloudy or even break from heat changes. Small gadgets like graters and garlic presses often trap food in tiny crevices, meaning they won’t come out truly clean. When in doubt, check the label or wash by hand to keep your kitchen tools in top shape.