Okay, if by crust you mean that nasty build up on the outside of the pan... you need to scrape it off with either an SOS pad or some steel wool. The outside of a skillet doesn't need to be seasoned since you don't cook on the outside of your pan.
(I can't even imagine why you would want to cook with your pans upside down...)
Get some dawn and steel wool. That will take it off. Then keep it clean with soapy water only on the outside of the pan. Don't forget to rub the inside with the oil of your choice after every cleaning. Also towel try the outside and heat dry the inside on the stove.
US $25.00
