7. Copper, Bronze, or Brass Items (Discolor)
Why it’s bad: The harsh detergents react with these metals, causing discoloration, tarnishing, or pitting.
The damage: Dark spots, greenish film, or uneven patina that is difficult or impossible to remove.
What to do instead: Wash by hand with warm, soapy water and a soft cloth. Rinse and dry immediately. Use a specialized metal polish to maintain shine.
Pro tip: For heavy tarnish, use a paste of lemon juice and salt, then rinse and dry.
8. Delicate Glassware (Etches and Breaks)
Why it’s bad: The high heat and harsh detergents can etch delicate glass (especially hand-blown or antique). The water pressure and jostling can cause chipping and breakage.
The damage: Cloudy film, rough texture, chips, cracks, or complete breakage.
What to do instead: Wash delicate glassware by hand with warm water and a mild detergent. Use a soft cloth or sponge. Rinse with cool water. Dry with a soft, lint-free towel.
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