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If your cast iron skillet is showing signs of rust, it could be because the skillet did not dry immediately after cleaning. Another reason could be improper storage of the pan. In addition, cast iron cookware should only be washed by hand. Do not use a dishwasher.
Solution:
Use a soft brush or fine sandpaper to remove rust stains, then wipe the area with vegetable oil. Store your cast iron cookware in a dry cabinet. If items need to be stored for a long time, place a paper towel between the lid and the pan to absorb moisture.