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Re:Ask HN: Favorite purchases of last two years? by Spivak on Thursday May 20, 2021 @03:03PM (#27225609)
Yep the “don’t use soap on cast iron” is a holdover from older soaps that had lye in them that could strip the seasoning (hence why you can use lye to reseason your pan).

If your seasoning is perfect (it isn’t) you could in theory leave it to soak too since it would be completely encased in the polymerized fat.

Re:Ask HN: Favorite purchases of last two years? by ska on Thursday May 20, 2021 @03:27PM (#27225887)
Yeah, the "don't soak it rule" isn't because it will explode if it's underwater for long, just that there are inevitably gaps and it doesn't do you any good. Just get it in there, have a good scrub, and rinse off.
Re:Ask HN: Favorite purchases of last two years? by bredren on Thursday May 20, 2021 @08:47PM (#27229288)
Ah okay. Thank you those in the chain.