5. Cast-Iron Cookware
Cast-iron pans are extremely durable, but the dishwasher is one place they do not belong.
The issue is not that the iron itself is fragile. The problem is the seasoning. A properly seasoned cast-iron pan has a thin layer of polymerized oil bonded to its surface. This layer helps reduce sticking and protects the metal from rust.
Dishwasher detergent, prolonged moisture, and high heat can strip away that protective layer. Once the bare iron is exposed, rust can form quickly.
How to Clean Cast Iron
Wash the pan by hand while it is still slightly warm. Use hot water with a brush or pan scraper. A small amount of mild dish soap can be used when necessary, but avoid prolonged soaking.
Dry the pan immediately and thoroughly. Placing it over low heat for a few minutes can help evaporate any remaining moisture. If the surface looks dry, wipe it with a very thin layer of cooking oil before storing it.
6. Nonstick Pans Unless Specifically Labeled Dishwasher-Safe
Some modern nonstick cookware is labeled dishwasher-safe, but repeated dishwasher use may still shorten the life of certain coatings.
Strong detergent, high heat, and contact with other cookware can gradually dull or damage a nonstick surface. Older pans and those with existing scratches are particularly vulnerable.
How to Protect Nonstick Cookware
Allow the pan to cool before washing it. Placing a hot pan in cool water may cause thermal shock and contribute to warping.
Wash it gently with warm water, mild dish soap, and a soft, nonabrasive sponge. Avoid steel wool, abrasive powders, and aggressive scrubbers.
If the manufacturer specifically states that the pan is dishwasher-safe, occasional dishwasher use may be acceptable. Hand washing, however, is generally the gentler option and may help extend the life of the coating.
If a nonstick surface begins peeling, flaking, or deteriorating significantly, follow the manufacturer’s replacement guidance.
