Wash the pan and dry it. You can get some pigskin if you want to maintain it. Wipe the pot with pigskin while it is hot. Do not clean after cleaning. You can wash it again before the next use, and it should be improved after repeated times.

Iron pans rust because iron reacts with oxygen atoms in water and air. I tell you, there is a very effective method, that is, after each cooking, don't brush the pan, let the oil stains stay in the pan, which blocks the contact with oxygen, so that the pan will not rust. Just wash the pot next time.