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This is, so far as I can tell, the very first episode of Dirty Jobs that ever aired.

Bat-Poop Collector. Mike starts on his dirty journey by checking out a bat cave. Not the kind you might like to have visited when you were young and wanted to be a superhero, but a real, live bat cave, where 40 million of the little guys live. And where they leave their poo. Lots of it. So much so that you can sink in it. In one scene, Mike gets caught up in it and needs the guide's help to get out. He barely does. Most sane people would probably be done with bats. Mike goes to visit a place where they make bats better. You decide what that says about him.

Mud Gatherer. And if that wasn't enough, he goes to see another kind of bat, but this kind is made of wood. That's right, baseball. For decades, one kind of mud has been used to put on brand new baseballs so that they aren't so slick that they slide out of the pitcher's hands. Mike is there to capture the process of, well, collecting the mud. A dirty job of there ever was one because once you collect it, you have to smear it on the baseballs and then pack the balls up to send to stadiums across the country.

Fish Gutter. The final stop on this first episode of Dirty Jobs is at a fish processing plant, where Mike cuts up all sorts of fish (including an Octopus), then follows the remains through the plant, as they are de-boned, de-oiled and finally mixed with dried up blood, pressed into pellets, bagged, and turned into... fish food. I am not making this up.