The most important thing I learned about cast iron is that the idea that you have to baby it is a hold over from the days when soap had lye in it. Today’s dish detergent is fine and won’t damage your seasoning, neither will basic green nylon scrubbing sponges. I was almost despondent about my carefully seasoned pans not delivering until I really went to town on them and removed the dull layer of burned on material and got them back to a shine. Now the eggs slide off.