When cleaning a cast iron skillet, you should avoid soap. We scrub with coarse salt, or if it's really stubborn, a plastic dish brush. Rinse the skillet out, towel dry completely, and season each time with oil. u003ca href=u0022https://www.cooksillustrated.com/articles/381-how-to-clean-a-cast-iron-panu0022 target=u0022_blanku0022 rel=u0022noopener noreferreru0022u003eHere's a great tutorialu003c/au003e!