I have a 30"slide in range Model #79095202103, Serial #VF241120916. I have never used the self cleaning cycle, but now that I am 70 years old, my kids talked me into using it. I removed the racks and washed them separately. However, when the clean cycle was finished, the top of my oven door turned yellow and I cannot remove the stain. What happened and how can I get it white again? Thank you