Gasoline Odor Removal?

Spilled 2.5 gallons of gasoline on our 3rd row cloth seat in the Trailblazer. Removed the seat and shampooed the carpets, sprayed air fresheners and the interior still stinks of gas after 1 week.

Is their anything that will remove the gas odor?

Thanks,

Ken

A details shop that offers ozone treatments might work, I would contact them first.