Picture related. Charcoal, not.
Every time I clean out my vehicles, I take the ten minutes and remove all the seats. Four bolts apiece and I can get in the crevices and hard-to-reach areas so much easier.
The picture is from tonight when I started in on my new project Subaru. Camel Wides butts EVERYWHERE. Not so much the smell that bothered me (which, yeah, I smoke, and old, wet butts smell godawful), but the filters are like sponges, transferring water to the carpet and then to the unibody. Took out the seats, toweled up the water, and left a half bag of Kingsford to absorb the smell and dampness.
Also makes it easier to clean the seats themselves and lubricate the tracks.
OCD, or normal?