How to Clean a Seasoned Cast-Iron Pan
Step 1: Very important—don't use soap or scouring powder on a seasoned pan. It will destroy the nonstick coating. Instead, sprinkle the pan with kosher salt and scrub it with a paper towel.
Step 2: Rinse the pan clean under hot water. Dry it immediately and thoroughly with paper towels, then apply a thin, even coating of vegetable oil. If you keep your cookware stacked, place a paper towel in the pan to protect its surface.