Thanks Kaz. I do have experience with CI pans, but they don't live outside. After my first cook I made a couple clean spots while wiping the griddle down with an oily paper towel, which promptly rusted. I need to spot-season those areas before I could use it the next time, and I'm just trying to avoid that in the future. After my last cook on it I basically took any chunks of food off and let it sit as-is. I guess I'll see how that works next time.