How to clean pink otter box defender case?

I put it in my black back and once i took it out, the edges and corners were BLACK. I tried soaking it in dish soap for a few hours, but that only seemed to dull the color. I have the defender (silicone) for the iPhone 5. Does anyone know how to clean it? I've tried rubbing alcohol as well (the ones that come in little tissue packets, because those are the only ones we have). I literally just got it 5 days ago.

Use neat dish soap and rub this in
Its only dirt build from your hands
Or try using a magic eraser on it
These are great on silicone

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