Chainmail on cast iron works wonderfully. https://www.amazon.com/s?k=cast-iron+skillet+scrubber&hvadid=722089627830&hvdev=c&hvlocphy=9013463&hvnetw=g&hvqmt=b&hvrand=2728257157696718677&hvtargid=kwd-751907401819&hydadcr=18711_13709481&tag=googhydr-20&ref=pd_sl_70e12gcixs_b
I don’t really “clean” my cast iron. Maybe (very, very rarely) a splash of mildly soapy water, chainmail round and round with some pressure and then wipe out with a dry, clean folded (quarters) paper towel. I usually don’t use any water and use the chainmail dry “scrub” while the pan is a little warm.
When the chainmail gets a little grungy I just throw it on the silverware rack in the dishwasher. Easy Peezy.