A small amount of mild dish soap is generally fine for a properly seasoned cast-iron skillet. The key is to avoid prolonged soaking and dry the iron thoroughly after washing.
Why the old warning persists
Traditional advice about soap often arose from older cleaning products and concerns about stripping fat layers. Modern polymerized seasoning is more durable than a loose coat of oil.
Use gentle cleaning
Wash by hand with warm water, a brush and a little dish soap for greasy residue. Avoid harsh soaking or dishwasher cycles. Stuck-on food may need a scraper or brief gentle simmer of water.
Dry and protect
Wipe dry immediately, warm briefly over low heat if needed and apply the thinnest film of oil when the surface appears dry. If the pan has rust, remove it and restore seasoning.
Frequently asked questions
Does soap remove all cast-iron seasoning?
Ordinary brief washing usually does not strip well-bonded seasoning. Aggressive abrasion or extended neglect can damage it.
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