Thermal mugs are great for keeping drinks at the perfect temperature, but washing them in the dishwasher can damage their mechanisms.
Intense heat can damage the vacuum seal between the double walls, reducing the cup’s ability to retain temperature. Additionally, plastic lids and rubber seals can warp or crack, leading to leaks, and harsh cleaners can leave a residual chemical taste or odor inside the container.
Here’s how to care for them: Hand wash the container and lid with warm, soapy water, using a bottle brush to reach deep into the interior. Air dry completely without the lid to prevent mold. Always check the manufacturer’s instructions, but hand washing is usually the safest option.
7. Copper vessels
Copper pots and pans are wonderful kitchen treasures, but they are also incredibly fickle.
Harsh detergents and high temperatures quickly discolor the beautiful surface, causing it to darken and stain. A dishwasher cannot provide the proper care necessary to maintain its shine, and some detergents can chemically react with copper, causing pitting or corrosion.
How to care for them: Hand wash with mild soap and warm water, then dry immediately to prevent staining. Polish regularly with copper cleaner or a simple homemade paste of lemon juice and salt.
8. Old or valuable porcelain
If you have antique porcelain or tableware with beautiful hand-painted designs, store it away from the dishwasher.
Repeated exposure to hot water and strong detergents will inevitably fade these beautiful designs. Older porcelain is also much more brittle, making it highly susceptible to chipping under high water pressure. Furthermore, thermal shock caused by rapid temperature changes can cause microscopic cracks in antique pieces.
How to care for them: Gently hand wash with mild soap and lukewarm water, using a soft cloth or sponge. Avoid abrasives, dry gently with a soft towel, and store in a safe place to prevent accidental knocks.
Bonus: Common Dishwashing Mistakes to Avoid
