Chiphead, This is not a commercial, but I continually amazed by the ability of "PB Blaster" to break loose rusted bolts/nuts. I would try to describe it, but I think it would be easier to just give you a link to their website. It used to be sold only at auto parts stores, but now I see they have it Wally-World (Wal-Mart).
PB Blaster Web Link
