You'll probably get better answers but were it mine: gas/oil = oil base. I'd pour alcohol over it, lightly scrubbing it, and vacuum it up with a powerful vacuum. Repeat 4-5 times. Then I'd pour baking soda all over it and let it sit on it a couple of days with the windows cracked or wide open as much as possible.
Last step for me would be: Vacuum up the baking soda then clean it with McGuire's carpet cleaner. Amazing stuff!!! Did an unbelievable job cleaning my carpet when I got the car. It even got old Coco-Cola off the head liner!!
found the same for 409 carpet cleaner,,,,worked wonders on mine, stains that had been there since i bought 'er...poof....gone. i wouldnt use baking powder though, it has an acidic component.stick to baking soda.
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