It's been awhile- IIRC, time, Febreeze, some slow-evaporating waxy stuff in a tub that reminded me of 1960s mens room air freshener, and a lot of parking in asphalt-ocean parking lots with the windows open in the sunny summertime. For awhile, if the weather was damp, and you let it sit a day, you could catch a whiff as you first got in, but even that finally went away.