I bought a paella pan at a flea market. I have no idea what metal(s) it's made of. It cooks like a nonstick but doesn't have a commercial nonstick coating. I clean it by washing it with dawn and hot water and dry it completely. The nonstick-ness survives the washing method. There is no stamp on the bottom.
1) How do I tell what my paella pan is made off? 2) Is it ok to continue to wash it without knowing what it's made of?