How to clean my hot pink otterbox?

I got a hot pink otterbox for my iPhone 5c, and the pink rubber already has dark marks where my hands go! I saw people using bleach for white ones, but i don't know if it would be ok for my pink one? What's the best thing to wash it in to keep it bright and flashy

Try using a Mr. Clean Magic Eraser.

Just use a little neat dish soap on a cloth
This will remove the oil dirt ect from your hands on it
Wipe with a clean damp cloth then use paper towel to dry it