so, I bought this unused Griswold #8 large logo smooth bottom skillet. the inside looks almost chrome, but it is not. the outside is grey iron. my question........there are a few spots on the inside. not rust. almost like a drop of something liquid dropped here or there. would it be safe to use steel wool to try to rub those spots off? you can still see a little of the sticker residue, and I want to leave that alone. or should I leave it all alone?? :-/ :-/ :-/