Here is my white device, which has turned yellow on one side while cooking an over done cheese burger:
Does anybody know whether it is possible to turn it back to the white color?
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Probably not, plus it will get worse over time.
I've an old George Foreman with similar marking.
Neither oxygen nor chlorine bleach works - plus it smells.
The only thing that very slightly works is a good hard scrub with something quite aggressive, oven cleaner or barman's friend etc, which will eventually take all the paint off.
You'll just have to live with it.
Try Magic Eraser Sponges, available at most stores that sell cleaning supplies. They really ARE magic for things like this very often! Worth the effort.