Redeye, I had my trip computer replaced a while ago and the dealer got some grease on my headliner and I used some Bisiel stain and spot remover. You can buy it a Walmart or any other department store. I used it because I have one of those littlegreen machine carpet cleaners that I use in my truck when the I TRIED TO BY-PASS THE CUSSING FILTER gets too deep. The cleaner worked great, I sprayed it on and let it sit for about 5 to 10 minutes and then scrubed it with a cloth and the stain came right out, rinsed it with a little water and a clean rag and you couldn't even tell there was a stain there.
Hope that helps
Big D