Diggin' this air-freshener in the car...

[wiskerbiscuit]

9/10 of the funk in most vehicles will be your window's, and headliner.

use a quality cleaner like Stoners invisible glass for the windows, and a mixture of woolite and water in a squirt bottle, mixed 10 (water) to 1 (woolite) for the headliner. maybe just a little less woolite for more delicate material.