Don't toss out a cast iron skillet because you spot a few rust spots; they can be removed with several household products, ...
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13 cast-iron cooking mistakes

You don’t understand seasoning You know all that talk about “seasoning” a cast-iron skillet? It’s not just talk. Seasoning refers to a layer of polymerized oil that has been baked onto the surface.
If there are stubborn areas, try a baking soda paste to help lift the rust from the cast iron. Mix two parts baking soda to one part water to make the paste. Apply the paste to the rust spot, and then ...