Thanks for the previous help. I put the skillet upside-down in my oven and ran the self-cleaning cycle. It did indeed burn away all the blackened seasoning of the old pan, returning it to it's former gray color. However, the inside of the pan now has a definite rusty color to it. I scoured it with Brillo and nothing changed. Has the rust gotten into the pan so deeply that I won't be able to remove it?