OK folks, I need some help. I was making custard in my Visions cookware (for those not familiar it is glass corning ware stuff) and I ran off to answer the phone and burned the beegeebers out of the custard. Nasty! The trouble is...I cannot get the blackened stuff off the bottom of my pot. It is welded on there. I have tried baking soda, vinegar...mixing the two...heating it up...plain old elbow grease...it is not budging. Does anyone have any ideas on how to remove this crud or should I just bite the bullet and buy a new pot?