I’ve tried many devices in my car to keep it smelling fresh, but many just don’t work.

I work several days a week cleaning stalls on a horse farm and between residual dirt (horse crap), and the fact that it frequently sits in the sun, it gets quiet...ripe. So I was wondering, what do you use? Because having to manually febreeze my car every time I get home from work to keep it from smelling like the north end of a south-bound horse is getting to be a pain in the butt (*badum tiss*). Thanks!