Actual conversation I had last week with my daughter: "Dad, did you cook something spicy in the skillet" (I have a cast iron skillet and normally am the only person who uses it)

"Yes, I made a sauce from chilis that was much too spicy, and used the skillet to cook the sauce down".

"Well, can you let me know next time, because I just made very spicy bacon!"

I normally only wipe down my cast iron skillet rather than cleaning it, and I think the metal is porous (even after seasoned), because I could still get a hint of spice on my finger from touching the cast iron surface.