2. DELICATE CRYSTAL AND FINE CHINA
If you own exquisite crystal stemware or fine china, it deserves the royal treatment.
High-pressure water jets can cause fragile glass to chip or shatter against other dishes. Harsh detergents and intense heat can permanently etch the surface of crystal, leaving it cloudy, no matter how much you polish it. Additionally, any delicate gold or silver coating will likely fade, peel, or wash off entirely.
How to care for them: Line a plastic basin with a towel to prevent slipping, and wash the pieces gently with mild dish soap and warm water. Rinse thoroughly and let them air dry on a rack, or dry them carefully 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 absolutely despise the dishwasher.
Harsh detergents and high heat will completely remove the layer of polymerized oil, known as seasoning, that gives cast iron its natural nonstick properties. Without this protective barrier, the iron will rust quickly when exposed to moisture and air. Over time, repeated dishwasher cycles severely degrade the iron’s surface.
Care instructions: Hand wash with hot water and a stiff brush (soap is rarely necessary). Dry the pan completely on the stovetop over low heat, and rub it lightly with oil after each wash to maintain the nonstick surface. Never soak cast iron for extended periods.
4. NON-STICK PANS
It may seem counterintuitive since nonstick pans are designed to be easy to clean, but they should stay out of the dishwasher.
Harsh detergents and high temperatures break down the nonstick coating (like PTFE or Teflon), causing it to buckle and lose its effectiveness. This accelerates wear, meaning you’ll be forced to replace your expensive pans much sooner.
How to care for them: Hand wash with a soft sponge and mild dish soap. Avoid abrasive scrubbers like steel wool. Always let the pan cool completely before washing to avoid warping. While some new ceramic-coated pans claim to be dishwasher safe, hand washing will always prolong their life.
5. ANYTHING WITH ADHESIVE LABELS
We’ve all tried to clean a baked-on sticker from a dish after a dishwasher cycle—it’s a nightmare.
When exposed to high heat and water, labels disintegrate, leaving a stubborn, sticky residue on dishes and inside the dishwasher. Worse yet, paper scraps and melted glue can clog the dishwasher’s filter, drastically reducing its cleaning efficiency. You’ll end up spending more time scraping off residue than you saved using the machine.
How to care for them: Always remove all labels and stickers before loading. Soak stubborn labels in hot, soapy water to loosen the adhesive, and gently use a razor blade or scraper to remove any remaining glue.
6. INSULATED TRAVEL MUGS & THERMOS
Insulated mugs are fantastic for keeping drinks at the perfect temperature, but the dishwasher can ruin their internal mechanics.
Intense heat can damage the vacuum seal between the double walls, compromising the mug’s ability to maintain temperature. Additionally, plastic lids and rubber gaskets can warp or degrade, leading to leaks, and harsh detergents can leave a lingering chemical taste or odor inside the container.
How to care for them: Hand wash the body and lid with hot, soapy water, using a brush to reach deep inside. Air dry completely with the lid off to prevent mold and mildew. Always check the manufacturer’s instructions, but hand washing is universally the safest bet.
7. COPPER COOKWARE
Copper pots and pans are breathtaking kitchen treasures, but they’re incredibly finicky.
Harsh detergents and high heat will quickly tarnish the beautiful finish, turning it dark and speckled. Dishwashers can’t provide the specific care needed to maintain that polished shine, and some detergents can actually react chemically with copper, causing pitting or corrosion.
Care instructions: Hand wash with mild soap and warm water, and dry immediately to prevent water spots. Polish regularly with a copper-specific cleaner or a simple homemade paste of lemon juice and salt.
8. OLD OR VALUABLE CHINA:
