I finally found the bottle in the back of a shelf!! Its the Pfaltzgraf stoneware and crystal cleaner. Can't recall where it was purchased. Made specifically to remove the gray marks from dishes (someone once told me these are actually a chemical reaction).
I would by Barkeepers Friend and try that on there. It is in a gold colored can and is a powder. I bought a slow cooker that had a white removable crock and it specifically told me to use that to clean any marks from the dish. It is not abrasive so it shouldn't harm your dishes.
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