The whole idea of a cast iron skillet, or a dutch oven, is that by cooking with oil a layer builds up that makes it non-stick. You can do this with a new pan or dutch oven by putting canola oil or flax oil or something similar on it and baking it in the oven with nothing in it for a couple of hours. After that, each use makes it just a little bit better, according to theory.
Soap will destroy all of the work of the ages. Supposedly such things as tomato sauce are also not good.
OK I get it, thanks. I have zero skill in cooking, if I boil water it would turn out burned lol, but I am a master with microwaves