Try something semi-abrasive - like an exfoliant, a loofah, facial scrub, etc. It's like self-tanner. Once the color's there, it's there, and until the skin cells that are colored start coming off, some of the color will still be there (although the more you wash it, it should keep fading). Something rough will remove any of the colored cells that are dead faster than just washing alone, so it should (in theory) come off fairly quickly.
Good luck!
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