Clean it, don't clean it, oil it, salt it, water it, "season it", season it by not cleaning it so your french toast gets all that good hamburger flavor from the night before...
I've read so many different ways to treat cast iron that at this point I'm convinced that it's all just superstition.
For those who don't know, you can wash cast iron with modern detergents, and as long as you dry it properly you won't have any problems.
It used to be that dish detergents contained lye that would strip the seasoning off of cast iron cookware.
Afer work, I once made dinner for my housemates. After the meal, one of the housemates was like: "if you cooked, you gotta wash the dishes!" ok, so I washed the dishes. After the dishes, the housemate was like: "If you used the cast-iron pan, you have to 'season' it with oil!" and I was like: wtf I worked all day, I cooked, I did the dishes, now I have to cook again just to make the pan happy?!? So I never used a cast-iron pan again.
Just leave it on the stove on maximum heat for one hour after each use, then chip off the carbonized chunks of asphalt that you've just created. 100% sterilized, no washing required, and smells just like your big bad diesel pickup exhaust.
I had a roommate that did this. Except their reason for not cleaning it was that they thought all that stuff leftover was what is called seasoning. AND they wanted the cast iron seasoning to flavor their dishes.
I tried to gently explain the misconceptions, but they believed their grandma instead of me.
Honestly, depending on the specifics here, not the worst. If they're using an oil that will polymerize, then as they oil/heat/cool cycle it, the seasoning will further develop over time, as long as they're somewhat scraping off remnants of their cooking as they finish, leaving it as clean as it can be without actually washing it, and then heat cycling it to sanitize any bacteria that might be there, I don't really see a problem with it....
It's not exactly up to modern hygienic standards, or social standards.... And I'm pretty sure if any restaurant or food joint did the same they would get shut down by the health inspector before long.... But you do you buddy.
For anyone not in the know, the thing with cast iron and cleaning is no longer a problem. Clean your cast iron. When cast iron was just about the only cookware, soaps included lye. Lye will erode the non-stick "seasoning" on cast iron. Modern soaps do not contain lye, so go ham.
Cleaning, however, introduces water.... And water causes iron to rust, so it is generally advisable to clean your cast iron cookware, then immediately heat it up past the boiling point for water, to vaporize any liquid water and carry it off the surface of the iron. Once past that temperature, let the cookware cool, then treat it with a thin layer of oil. This will protect the surface from atmospheric moisture and allow the cookware to work over much longer periods of time without needing to be "re-seasoned" (which is removing the layers of polymerized oil on the cast iron, and then re-applying it using a slow method of oiling, then heating the cookware, allowing it to cool, oiling then heating again)...
Don't be afraid of cast iron, it needs a little more attention than other cookware, but it's a joy to actually cook with.
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