How can I remove a massive dried paint stain from the car seat of a 135i?

I hadn't realized the indigo blue acrylic paint I was using for an art project had a leak until I got back from a weekend-long trip and saw the huge stain on the passenger seat of my car. I was able to successfully remove a paint stain from another car with a little gasoline on a rag, but the car I'm driving now has light "Boston lemon" leather and I have absolutely no idea how to treat it. What should I do? Covering it with a car seat is not an option.