PorcelainIf you have beautiful crystal glass or fine porcelain, it deserves the royal treatment.
High-pressure water jets can cause fragile glass to collide with other dishes or shatter. Harsh detergents and intense heat can permanently damage the crystal’s surface, making it appear cloudy no matter how often you polish it. Additionally, delicate gold or silver plating is likely to fade, chip, or wash off completely.
How to care for them: Line a plastic container with a towel to prevent slipping, and gently wash the pieces with a mild detergent and lukewarm water. Rinse them thoroughly and let them dry on a rack or dry them gently with a lint-free cloth. Never stack heavy objects on top of delicate pieces.
3. Cast Iron Pans
Cast iron pans are the undisputed workhorses of the kitchen, but they can’t stand the dishwasher. Harsh detergents and high temperatures remove the polymerized layer of oil—also known as “seasoning”—that gives cast iron its natural nonstick properties. Without this protective layer, the iron will quickly rust when exposed to moisture and air. Repeated use in the dishwasher will severely damage the iron’s surface over time.
Care Instructions: Hand wash with hot water and a stiff brush (soap is rarely needed). Dry pan completely on stovetop over low heat and lightly oil after each wash to maintain nonstick coating. Never soak cast iron pans for extended periods.
4. Non-stick pans
It may seem counterintuitive, considering that non-stick pans are designed to be easy to clean, but they are not dishwasher safe.
Harsh detergents and high temperatures will damage non-stick coatings (such as PTFE or Teflon), causing them to chip and lose effectiveness. This will accelerate wear and tear, meaning you’ll need to replace your expensive pans much sooner. How to care for them: Hand wash with a soft sponge and mild detergent. Avoid abrasive pads such as steel wool. Always let your pan cool completely before washing to prevent warping. Although some newer ceramic-coated pans are labeled dishwasher safe, hand washing will always extend their lifespan.
5. Anything with adhesive labels
We’ve all tried to scrub a sticky sticker off a plate after a dishwasher cycle—it’s a nightmare.
The heat and water will cause the labels to break down, leaving a tough, sticky residue on your dishes and inside your machine. Worse, the paper shreds and melted glue can clog your dishwasher’s filter, drastically reducing its cleaning efficiency. You’ll spend more time removing the residue than you’ll save by using the machine.
How to maintain them: Always remove all labels and stickers before placing them in the printer. Soak stubborn labels in warm, soapy water to loosen the adhesive, and carefully use a razor blade or scraper to remove any remaining adhesive residue.
6. Insulated travel mugs and thermoses
