Picked up several pans from a private lady couple months ago. All cleaned up nice - but one. A 10 1/4" fry pan that has heavy, hard crud around the outside of the pan. Ly bath did nothing for it. Have tried 2 different paint removers (It was painted black) which got the paint off. Nothing has touched the thick hard layer of crud. Even a chisel does not faze it. Bottom is cleaned enough to see it is not branded, does have a heat ring but no collector value to this pan at this point. Next step is going to be the air scalar out in the shop. Pan is no good this way so doubt I can hurt it much. Nothing else will make a good cat pan.