You absolutely can clean cast iron with soap. The important thing is to not over scrub it.
When you oil a cast iron and “season” it, the oil turns into a polymer that is pretty resilient against soaps/detergents but is fairly easily scratched away. Light scrubbing with things that aren’t too abrasive is fine, but steel scrubbers will strip it off.
Luckily you can always re-season pans.
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