Its hard to admit that taking care of cast-iron cookware is not as easy as it seems.
Its bonded to the surface of the pan, so use soap when cleaning.
Youre supposed to use a layer of polymerized oil too.

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Dry it as soon as possible.
Coat the pan with a small amount of oil after drying.
For example, you do not want to slow cook a Bolognese sauce in the cast iron skillet.

Youre supposed to give it a quick re-seasoning after every use.
Gently wash with soap and water while giving it thoroughly dry.
Rub down one more time and let it cool.
