Why it’s bad: Many insulated mugs and thermoses have a vacuum seal between two walls of metal or plastic. The high heat can break the seal, ruining the insulation.
The damage: The mug or thermos will no longer keep drinks hot or cold. Condensation may form on the outside. The seal may be permanently compromised.
What to do instead: Wash by hand with warm, soapy water and a bottle brush. Rinse thoroughly. Dry with a towel.
Pro tip: Check the manufacturer’s instructions. Some high-end brands (like Yeti) claim their products are dishwasher-safe, but hand-washing extends their life.
7. Copper, Bronze, or Brass Items (Discolor)
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