I just wash it out with hot water and a brush until it is clean (no soap). Then I put it on the stove and turn it on high. Once it is hot and starting to smoke, I put about a teaspoon of oil on it, wipe it around with a paper towel, and wait for it to start smoking again and turn off the heat.
After it cools down, I hang it on a rack in the kitchen above the stove.
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