The seasoning on cast iron is polymerized oil and it’s chemically bonded to the iron. You’re only really going to be removing the seasoning if you’re using abrasives or scrubbing too hard with steel wool or something like that.

https://www.seriouseats.com/the-truth-about-cast-iron#toc-myth-4-dont-scrub-with-soap

Any loose bits of black gunk that are coming off while you’re cleaning it with a sponge or a scrubby are just burnt food.

It’s an image of a scene from the Clue movie:

Col. Mustard: Are you trying to make me look stupid in front of the other guests?

Wadsworth: You don’t need any help from me, Sir.