J.C.
I would like the answer to this too. Mine get like that also. I have a friend who sells Pampered Chef so I've slowly been replacing my pans with theirs. They're guaranteed to not rust. I have a few cookie sheets (that I use a lot) two of the round pans and one square. So far none of them have rusted and I've even put some in the dishwasher a few times. My problem is I love my 9X13's with the plastic lids for cakes and brownies and they don't have anything like that. Hope someone has an the answer!