How to clean iPhone otter box case?

So I recently got a new otter box case for my iPhone 4S and it's pink & white. I put my phone in my back pocket a lot and today the jean ink rubbed off on the white part of my case. I've washed my jeans a lot so I don't think that's the solution. Any way I can safely clean the blue ink off of the white part of my case?

A baby wipe that's what I used on my iPhone outer box

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