A.S.
I have a friend who has used the kit from them that you do the whole piece with, and it worked wonderfully. But that sounds like a huge expense and a lot of work for two ink stains. The Leather Magic people have and Ink and Stain Remover that you might want to try first. Here's a link: http://www.leathermagic.com/Pages/careforleather.htm
Good luck. And be sure to use any of this with the car doors wide open and maybe even a fan circulating air through the car.
A.