To remove rust spots from your old, well-seasoned cast iron skillet, follow these steps:
Scrub the Rust: Use a scrub brush or steel wool to scrub the rusted areas. Remove as much loose rust as possible. Be gentle, so you don't damage the seasoning or the skillet's surface.
Wash the Skillet: Thoroughly wash the skillet with warm, soapy water to remove any remaining rust particles and debris. You can use a sponge or cloth for this step.
Rinse and Dry: Rinse the skillet thoroughly to remove any soap residue, as it can interfere with the seasoning process. Then, pat the skillet dry with a clean towel.
Vinegar Soak: Create a mixture of equal parts white vinegar and water. Submerge the rusted areas of the skillet in this solution. Let it soak for about 30 minutes to an hour. The vinegar will help dissolve the rust.
Scrub Again: After the vinegar soak, scrub the rusted spots again using a scrub brush or steel wool. The rust should come off more easily this time.
Rinse and Dry Again: Rinse the skillet with water to remove any remaining vinegar. Then, dry it thoroughly with a clean towel.
Re-seasoning: Re-season the skillet to protect it from future rusting. Apply a thin layer of cooking oil (such as vegetable oil, flaxseed oil, or canola oil) to the entire surface of the skillet, including the handle. You can either wipe the oil on with a paper towel or use a small amount of oil and spread it evenly with your fingers.
Bake the Skillet: Preheat your oven to 375°F (190°C). Place the skillet upside-down in the oven to allow any excess oil to drip off. Put a baking sheet or aluminum foil on the lower rack to catch any drips. Bake the skillet for about 1 hour, then turn off the oven and let the skillet cool down inside.
Repeat Seasoning: If your skillet still looks dry after the initial seasoning, you can repeat the process of applying oil and baking it again to build up a better seasoning layer.
By following these steps, you can effectively remove rust spots from your cast iron skillet and restore its seasoned surface. Remember to continue regular maintenance and proper seasoning to keep your cast iron skillet in excellent condition.