How to remove olive oil from car seat?

I went to the supermarket got me a bottle of olive oil on my trip back home bottle cracked and spilled all its content on the car seat. How do I get rid of the oil that has soaked the entire sponge in my car seat without replacing my whole seat? The heat its making it smell bad, and have tried those super absorbent towels but nothing seems to get rid of the oil remaining in the sponge of the seat. I'm really desperate!