Febreze is NOT the answer. It just adds another smell to the one already there.
Get an air purifier to filter out the chemicals. It may take hours, but even a small one can be powerful.
The best thing might be an ozone generator. It works something like an air purifier, but besides filtering the air, it breaks down chemicals. Hotels use them to get rid of cigarette odor in rooms. Some auto body shops use them to freshen car interiors. They are wonderful, but I'm not sure where you'd get one. Maybe see if you could rent one.
You could try vacuuming the upholstery, maybe even using some carpet cleaner on a small section of it to see if that helps.