Amy,
Pick up Grease Lightning and saturate the spot, then scrub it really well, then let it sit for a bit and rinse it off. If that doesn't completely remove the spot redo it only this time let the Grease Lightning sit longer. I swear by the stuff, the only thing is you can't use it on wood, but it works great and has even gotten printing ink out of my husbands cloths after months of washing and drying. A few months ago my son had his pen explode in his pants pocket and all over the tan seat of my car. Unfortunately it was in the back seat and I didn't see it for a few days, but used the Grease Lightning and it came right out. Hope this works that great for you.
Hugs,
T.