Copper pans, bowls, and decorative utensils can lose their bright finish in the dishwasher. Strong detergents may tarnish or discolor the surface, while high heat can affect certain coatings and finishes.
Some copper cookware also contains bonded layers or special linings that require careful cleaning. The correct method depends on whether the copper is bare, lacquered, or lined with another metal.
How to Clean Copper
Wash copper cookware by hand with warm, soapy water and a soft sponge. Dry it promptly with a clean cloth to help prevent water spots.
For tarnish on uncoated copper, use a cleaner specifically approved for copper or follow the manufacturer’s care instructions. Avoid using homemade acidic cleaners unless the manufacturer confirms they are suitable for the item’s finish.
8. Insulated Travel Mugs and Vacuum Bottles
Reusable travel mugs and vacuum-insulated bottles may look dishwasher-safe, but many models contain seals, adhesives, coatings, or vacuum layers that can be damaged by heat.
Some lids are dishwasher-safe even when the bottle itself is not. Repeated dishwasher cycles may also cause painted designs and decorative coatings to fade or peel.
How to Clean Insulated Bottles
Check the care label or manufacturer’s instructions first. If hand washing is recommended, use warm water, mild dish soap, and a bottle brush.
Clean lids, straws, mouthpieces, and removable seals separately. Food residue and moisture can collect beneath silicone gaskets, so remove them when the manufacturer’s instructions allow it.
Let every component dry completely before reassembling the bottle. Trapped moisture can contribute to unpleasant odors or microbial growth.
Cast iron and copper are obvious candidates for hand washing, but several ordinary objects can suffer damage that may not become visible until many dishwasher cycles later.
Other Items Worth Thinking Twice About
Untreated Aluminum Cookware
Some untreated aluminum items can darken, discolor, or develop a dull surface in the dishwasher. Strong alkaline detergent may react with the metal and leave marks or residue.
Anodized or coated aluminum may have different care requirements, so always check whether the manufacturer considers the item dishwasher-safe.
Disposable Plastic Containers
Thin takeout containers and single-use plastics may warp, shrink, or melt under dishwasher heat. They are not necessarily designed for repeated washing or high-temperature use.
Only place plastic products in the dishwasher when they are clearly labeled dishwasher-safe. If a disposable container becomes warped, cracked, cloudy, or damaged, it is best to discard it.
Plastic Items on the Bottom Rack
Even dishwasher-safe plastic can sometimes warp if placed too close to a heating element. The top rack is generally safer for lightweight plastic items unless the manufacturer states otherwise.
Secure small items so they cannot fall through the rack or interfere with the spray arms and heating components.
Items With Adhesive Labels
Jars, bottles, and containers with paper labels or stickers can create a mess inside the dishwasher. Labels may peel off, break apart, and collect in the filter or drain components.
Remove paper labels and as much adhesive as possible before placing reusable containers in the dishwasher. Confirm that the container itself is dishwasher-safe.
Hand-Painted Mugs and Ceramics
Personalized mugs and hand-painted ceramics may fade or lose their decorative finishes over time. Some designs are applied over the glaze and may not tolerate strong detergent or repeated high heat.
If the artwork is handmade, sentimental, or not clearly labeled dishwasher-safe, hand washing is usually the safer choice.
