Does anyone else have this problem? The bottom of my Large Stoneware Bar Pan has some sort of "goo" on it. I think it comes fromwhen I put the pan on top of my stove after taking it out of the oven. The "goo" is only in the corner of the pan that was resting on the burner that the oven vents through. I have tried using the scraper on it and it just won't go away. I'm planning on using the bar pan at each of the shows I have booked for May, but I can't take it to a show with this stuff on it. Has anyone else seen something like this? Any suggestions on getting rid of the "goo?" I've had the bar pan for around a year now, so I'm not sure about exchanging it.