Not using soap is nasty. The seasoning is actually the polymerized oil so it don’t give two shits about soap and only comes off with a lye based oven cleaner in my experience. You should apply a thin coat of oil after washing them but I haven’t found that to mater much vs doing it next time you cook.

Stripping and re-seasoning a cast iron pan is super satisfying too! Strip it down by your mean of choice, coat with oil and put in pre-heated oven upside down. Repeat a few times as it stops being tacky/smoking and you’ll have a pretty golden pan that is good as new!

Stainless is what I use for all my pots though. Great stuff!