Image zoom Stack of Old Cast Iron Pans | Photo by MeredithHow to Clean a Cast Iron Frying PanTo clean, just use mild dish soap (that's right, it's okay to use a little soap!) Heat your clean cast iron pan on the stove until it's crazy hot. Image zoom Wiping Oil on a Clean Cast Iron Pan | Photo by MeredithAnd that's how to season a cast iron pan! For more on cleaning rusty cast iron, check out how to clean a rusty cast iron pan. Cast Iron FAQSo that's how to clean and season a cast iron skillet.