I do not know what I did wrong. The pamphlet that came with the griddle said to pre-wash with warm soapy water. I did this. The Weber website says to season the griddle. I did not do this, because I don’t think you’re supposed to do this with enameled cast iron. I grilled bell pepper and onion strips. They turned out perfect. But it looks like the griddle is forever stained from the experience. I tried the warm soapy water, but there are still stains and a stickiness that l think will eventually become rust spots. Again, not sure what I did wrong. I can’t believe Weber would manufacture a product that looks horrible after one use.