I've always had good luck with magic erasers for stubborn stains. And for protectant, I've used RaggTopp products. It's not perfect but has been good enough. There are some stains that just won't come out of a white top.
I've not used it on the door panels. I don't see why it wouldn't work. Just try it on a hidden place first. I have used it on the interior quarter trim (where the rear speaker is).
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