Every day on my way to work, I pass the Buffalo Trace Distillery in Frankfort, KY.
On certain days, it emits an odor that can only be described as "a rotten, sweaty gym sock".
I'm pretty sure it's got something to do with the mash tanks, but I still maintain that such a horrible odor can have anything to do with the wonderful bourbon they make. Surely Dirty Jobs can get to the bottom of this one.

Also, there are plenty of horse farms in the area. I'm sure there's plenty of dirty jobs to be had at one of those places.