Yes, if you clean your cast iron skillet with dishwashing liquid and hot water (without scrubbing), you should season it afterward. Seasoning is the process of applying a thin layer of oil to the surface of the cast iron to create a non-stick coating and protect it from rusting. Here's how you can season your cast iron skillet after cleaning it:
Dry the skillet: After washing with dishwashing liquid and hot water, thoroughly dry the skillet with a clean towel or paper towels. It's crucial to remove all moisture to prevent rust.
Apply a thin layer of oil: Using a paper towel or cloth, apply a thin coat of cooking oil (such as vegetable oil, flaxseed oil, or grapeseed oil) to the entire surface of the skillet, including the handle. Make sure to coat both the inside and outside.
Remove excess oil: After applying the oil, use a clean paper towel to wipe off any excess oil. The skillet should look almost dry, with just a thin, even layer of oil remaining.
Bake the skillet: Preheat your oven to around 350-400°F (175-200°C). Place the oiled skillet upside down on the oven rack or on a baking sheet to catch any drips. Bake the skillet for about 1 hour.
Let it cool: Once the baking time is up, turn off the oven and let the skillet cool inside the oven. This gradual cooling helps the oil to bond with the cast iron, enhancing the seasoning.
Remember that the more you use your cast iron skillet, the better the seasoning will become over time. Additionally, avoid using soap in future cleanings, as it can break down the seasoning. Instead, use hot water and a brush or gentle scrubber to clean, and make sure to dry it thoroughly after each use. Regularly seasoning your cast iron skillet will help maintain its non-stick properties and prevent rusting, ensuring it serves you well for many years.