No, it is not recommended to substitute olive oil for vegetable oil when cleaning a cast iron skillet. While both oils are commonly used for cooking and seasoning cast iron, they have different properties that make them unsuitable for certain tasks.
When it comes to cleaning a cast iron skillet, the most common method is to use a process called "seasoning," which involves applying a layer of oil to the skillet's surface to protect it from rust and improve its non-stick properties. For this purpose, it's generally recommended to use oils with a high smoke point and neutral flavor, such as vegetable oil, canola oil, or flaxseed oil. These oils can withstand high temperatures without breaking down or imparting strong flavors to the skillet.
On the other hand, olive oil has a lower smoke point compared to vegetable oil, which means it can break down and burn at higher temperatures. Using olive oil for seasoning or cleaning a cast iron skillet could lead to the oil smoking or even developing a bitter taste. It's best to reserve olive oil for lower-temperature cooking or as a finishing oil for flavor.
To clean a cast iron skillet, you can follow a simple process: after cooking, remove any food debris with a stiff brush or a non-abrasive sponge. If necessary, you can add a small amount of mild dish soap and warm water, but avoid soaking the skillet. Rinse it thoroughly, then dry it completely. Finally, apply a thin layer of vegetable oil or another suitable oil to the skillet's surface to maintain its seasoning and prevent rust.