Plenty of other sources too, including Kenji Alt-Lopez, who seems to carry some weight itt:
Quote:
People are irrationally afraid of caring for cast iron. The truth is, once you've got a good layer of seasoning, cast iron is pretty tough. You can't scratch it out with metal utensils. You can't destroy it by using soaps (modern dish soaps are very gentle on everything except for grease)
* * *
That's a myth [referring to never using soap], probably a hangover from when soaps used to contain lye and powerful detergents that would pit the metal. Modern soaps are very gentle, and designed to attack only grease, not the polymer build-up on a good cast iron pan. That said, it's best to avoid it in the early stages of building up your seasoning, but even then, if you need a little, it's not the end of the world as long as you carefully dry, heat, and re-oil your pan with each use.
Now someone plz post a steak.