<human>:  How do I clean a cast iron skillet?
<bot>: To clean a cast iron skillet, start by scrubbing it with a stiff brush and hot water. Then dry it completely with a clean cloth or paper towel. After it is dry, rub a thin layer of vegetable oil all over the skillet, using a paper towel or cloth. Finally, put the skillet over a low heat until the oil starts to smoke, and then turn off the heat and let it cool before using.