HELP-BAD SMELL-2002 Pathfinder

Someone I know ran out of gas and used my 2002 Pathfinder to get some. The can of gas spilled in the back. This was 2 weeks ago. I removed the carpet and brought the car for detailing (shampooing carpet and seats, etc.). The smell did not go away. In fact now combined with the smell of armour all it's even more toxic. I got a product called ZORBX. Didn't work. I've put different odor absorbing products in and nothing works. I leave the windows open day and night and have run the a/c for hours on full blast to try and get the smell out. I think the biggest problem is that the smell has gotten into the a/c system. Is there anything I can do to get it out? The minute the a/c is turned on, there's a nauseating gas/armour all smell. HELP!