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I have a leather care kit that I use to get ink out of leather furniture, it will work on your seats as well, just use it sparingly as it will clean the daylights out of the treated area and make the rest of the seat area look dirty, so only use a small amount on a q-tip and then reapply as needed. The place I got it from is www.leatherworldtech.com and the stuff is called "Ink and Stain Remover". Good luck!!!
Trust me it works, I have 4 kids, that kind of stuff happens here from time to time.....