Okay its summer in Houston and the truck is getting kinda funky smelling.
I bought the refills for the plug in type home air freshner and put it in a koozie in the rear cup holder and it works great!
Also you can put some dryer sheets under the seats and they work too.

 

LOL, I once owned a business with 3 dakota's....one of my men had a kid with a hamster.....it got into his tote bag, in the truck, and tried to live there, no food, no water.... 90' summer days, and DAMN.....what a smell..........needless to say, had to defume it for 3 weeks before it came back to normal...sorta...................