Get a new car.
Seriously, I doubt this will ever go away completely, and I think
it's probably quite a health hazard. I don't think after a time if
you don't smell it, that it means its gone necessarily. I'd think
about turning it in as an insurance claim. If it was on the carpet,
or any fabric such a seats, those can be replaced. On a non-pourous
surface it could be cleaned, but I don't think steel is even totally
impervious to gasoline. I know one thing for sure, I wouldn't
breathe gas fumes if I could help it.
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