This dirt is removed very poorly and there is actually nothing to do with it. You will never get rid of the blackness that settles on the pans from the gas burner. This should be done immediately and each time you use the pan or pot. But few follow this rule. I didn't do it either, so I know what I'm talking about. I then sprayed it with all possible degreasers, let it work for three hours, then rubbed it with a metal wire and sand, and I cleaned it up a lot, but never completely. He doesn't have gas anymore, so my dishes are no longer dirty.