First time I cooked with my grandmother-in-law she said I was too clean for cast iron cooking. I attempted to put her skillet in the sudsy sink. I think about her every time I use that skillet. I asked for it when she passed away. It had been her mother’s. I also got their cast iron griddle.
Always clean a cast iron grill by getting it hot and rubbing it out with paper towels. Thats all.