That said, everyone should know the different ways of cleaning the things.
Bar keepers Friend, for the equivalent oxalic acid/ddbsa cleaner in your area will remove dark carbon from most surfaces, especially when used with a magic eraser/melamine sponge
If you have a pot or a pan or something movable that is very burnt on, soaking it in an extremely dangerous solution of potassium hydroxide (lye) well absolutely remove all the organics. You just have to be sure to wear gloves and splash protection because it will blind you in a hot second.
Soaking rusty items in vinegar for a prolonged period of time will remove the rust, but you’ll have to treat it pretty quickly to keep the rusr from coming back.