How to remove dirty black marks from a white rubber iphone case?

After being in numerous pockets and bags for a number of months, my white rubber iphone case has become grey-ish and dark around the corners by dirt and is there anyway i can get rid of it and make it white again? Its a top notch iphone case and it was a bit pricey so i don't want to throw it away and get a new one: S

Toss it in the washing machine. Phone and all.

Try an eraser or one of those Mr. Clean scrub pads or buy a new case. They don't cost that much.

Mr. Clean Magic Eraser. Works like a dream on that sort of thing. No chemicals, no muss, no fuss.

I would just use neat dish soap and a sponge
Its only surface dirt it will come up lovely
Give it a good wash rinse and air dry

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