So you bought a used CI. I would bake it lid off in over at is highest setting to remove all evidence of oil, food, grim etc. Then start the process of seasoning.
If it looked like it was taken care of real well and perfectly clean without any smell, maybe I wouldn't bake it so much but maybe enough to sterilize it and then season.
I never use soap on my CI. Just hot water and a scrub brush. Then I put it on the stove to heat up and smear it with veg oil all over the inside. When it is to hot to touch, I turn the burner off and allow it to cool. After, wipe extra oil off.
Then when ready to use again, I use hot water and a scrub brush to remove any lint. Rub it down with a little oil and proceed with the recipe.
Always keep it oiled.
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