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Cleaning burnt oil from inside an old cast-iron skillet requires some effort, but it is possible. Here's a step-by-step guide to help you clean it effectively:

  1. Safety first: Make sure you have proper ventilation in your kitchen area, as the cleaning process may produce smoke and strong odors.

  2. Remove any loose residue: Use a stiff brush or scrubber to remove any loose food particles or debris from the skillet.

  3. Heat the skillet: Place the skillet on the stove and heat it on low to medium heat for a few minutes. This helps to loosen the burnt oil.

  4. Add salt or baking soda: Sprinkle a generous amount of salt or baking soda onto the bottom of the skillet. These abrasives will help in the cleaning process.

  5. Scrub the skillet: Use a scrub brush or a sponge with a scouring pad to scrub the skillet's surface vigorously. Focus on the areas with burnt oil, applying pressure to remove the residue.

  6. Apply a vinegar solution: If the burnt oil remains stubborn, create a solution of equal parts water and white vinegar. Pour it into the skillet and let it simmer for a few minutes. The acidity of the vinegar helps break down the oil.

  7. Continue scrubbing: After simmering with the vinegar solution, scrub the skillet again to remove any loosened oil and residue. You can also use a wooden or plastic scraper to gently scrape away any stubborn spots.

  8. Rinse and dry: Thoroughly rinse the skillet with hot water to remove any remaining residue. Avoid using soap, as it can strip the seasoning of the cast iron. Dry the skillet completely with a towel or by placing it on low heat on the stove.

  9. Re-season the skillet: After cleaning, it's essential to re-season the skillet to restore its non-stick properties and prevent rust. Apply a thin layer of vegetable oil or melted shortening to the skillet's entire surface, including the exterior and handle. Place it in an oven preheated to 350°F (175°C) for about an hour. Let it cool in the oven before removing.

  10. Store properly: Once the skillet is completely cool, store it in a dry place to prevent moisture and rust formation.

Remember, cleaning a cast-iron skillet may require repeated attempts, especially if the burnt oil is heavily built up. Be patient and persistent in your cleaning efforts to restore the skillet to its optimal condition.

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