Or, I'd follow Bob's advice (always good advice from him!) but if you have any scraps of cloth put some of that grease on a scrap and try.... a product. Woollite? Quick Clean or????
Hey Bob, As an alternative you might call a good local auto detailing shop. I have seen them remove some amazing stuff from the interior and exterior of my daughter's car! From paint to ink, gum/candy you name it!
Justa thought!
Good luck,
Dan
