I like to use Goo Gone or a combo of Leverage interior vinyl cleaner and goo gone and the Magic Eraser. If you already blasted it with every chemical in your garage, I would take some soft scrub, "GENTLY" scrub down with the Miracle Eraser, if it does not take it out completely, take a big sponge, wet it, and leave it on top of the stain overnight. This will not take out the stain, however, it will prep it for the sunlight. Leave the stain uncovered for a week in the sunlight and you should be fine.
I think the Magic Eraser will take it out, if not, a combo with the sun will.