I know that toothpaste remove scratches on a large scale such as car's headlights. I've tried it actually on my car's headlight and it cleared the vision a bit. Try it on your cell phone it might actually work.
I heard snake oil works well too.
I have a useless Nokia N9 lying around i'll scratch it and then try this for you, (I know it might be a sick joke ) I'll also try it dry and wet (using two different scratches ...
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