To restore the black color and seasoning of a cast iron griddle that has been cleaned with soap and water too many times, you can follow these steps:
Deep Cleaning: If there is any food residue or rust on the griddle, start by giving it a thorough cleaning. Scrub the griddle with steel wool or a wire brush to remove any buildup. You can also use a mixture of equal parts white vinegar and water to help dissolve any rust. Rinse the griddle thoroughly with water.
Seasoning Removal: If the griddle has a thick layer of old seasoning that is flaking or uneven, you may need to remove it. Place the griddle in the oven and run the self-cleaning cycle, or use a commercial oven cleaner according to the product's instructions. This process will burn off the old seasoning and leave the cast iron bare.
Scrubbing and Washing: After the self-cleaning cycle or using oven cleaner, scrub the griddle again to remove any remaining residue. Wash the griddle with hot water and a small amount of dish soap to ensure it is clean and free from any traces of oven cleaner.
Drying and Heating: Thoroughly dry the griddle with a towel, then place it on the stovetop or in the oven to remove any remaining moisture. Heat the griddle until it is completely dry. This step is crucial to prevent rusting.
Applying Oil: Once the griddle is dry and still warm, apply a thin layer of vegetable oil or flaxseed oil (or any oil with a high smoke point) to the cooking surface and the sides of the griddle. Use a paper towel to spread the oil evenly and remove any excess.
Baking the Oil: Preheat your oven to around 400-450°F (200-230°C). Place the griddle upside-down on the oven rack (with a baking sheet or aluminum foil below to catch any drips) and bake it for about an hour. This process, known as seasoning, will create a new non-stick layer on the cast iron.
Repeat Seasoning: For best results, repeat the oil application and baking process a few more times. This will help build up a strong and resilient seasoning layer, restoring the black color and non-stick properties to your cast iron griddle.
Remember that seasoning is an ongoing process, and with regular use and proper care, your cast iron griddle will continue to improve in performance and appearance over time. Avoid using soap in the future when cleaning your cast iron to preserve the seasoning and maintain its black color. Instead, use hot water and a brush or sponge to clean it gently.