About ten years ago we replaced our entire kitchen cabinetry with white cabinetry. Over the stove (right side) over the burner I use most often, the top cabinet door has turned a little yellow. NONE of the other doors have done this. It started a few years ago and this year, it has gotten worse and is starting to look bad/noticeable. I have tried cleaning it with bleach...no luck. Same with regular cleaning sprays. The place I bought the cabinetry from went out of business (it was like a Home Depot) and I can't find this company anymore...so I can't replace the door. Anybody have any idea of what might be able to clean this? Thanks.