The episodes from season four of Dirty Jobs are listed below.

1 – Big Animal Vet | Originally Aired on January 8, 2008
Mike goes to work at a famous Georgia barbecue establishment and finds himself up to his greasy elbows as he learns the messy business of making great tasting smoked meat. Next, Mike travels to Montana to meet up with a large animal vet and assume the role of his apprentice. Finally, our journeyman finds work excavating oil tanks in New Jersey.

2 – Steel Mill Worker | Originally Aired on January 15, 2008
Mike Rowe grabs his hardhat and goes to work in St. Louis at a scrap metal yard that specializes in recycling giant river barges. While on the job, Mike learns how to use a blow torch to cut up the barges into little pieces, and he quickly discovers that demolishing barges is a dirty and dangerous job. Upon mastering the art of dismantling barges, Mike follows the recycled steel to a St. Louis steel mill where the small pieces are melted into metal. Mike jumps onto the production line where he gets utterly filthy unloading thousands of pounds of steel from the trains, and then preps it for the steel making process. It’s a fascinating look at how the steel industry works, as well as a salute to the steel workers of America.

3 – Cave Biologist | Originally Aired on January 22, 2008
Mike Rowe teams up with a cave biologist, who takes him into a labyrinth of caves in the state of Kentucky. In this particular cave, biologists have been working to clean up a toxic sewer leak from a nearby town that has devastated the ecosystem. After the work with the cave biologist is complete, Mike helps a group of cavers map new parts of the cave. This is a fascinating dirty job that takes viewers into a world that is rarely seen, but it proves to be a very difficult job when Mike literally gets stuck between a rock and a hard place — and has to wait for someone to pull him out. Mike then heads to the coast of Maine to join forces with slime eel fishermen. Climbing around a hagfish boat, his first task is to separate buckets full of eels from their slime. Fishing for slime eels is a dirty job that Mike and the gang won’t soon forget.

4 – Buoy Cleaner | Originally Aired on January 29, 2008
This week Mike Rowe goes to work at an Oregon family-run business that makes wood shingles. It doesn’t take long before Mike learns this job is as dirty as it is dangerous. Then, Mike signs on with the United States Coast Guard to help clean buoys off the coast of San Francisco. It’s a disgustingly dirty job that must be done in order to keep the buoys afloat so they can guide the ships coming into the harbor.

5 – Cranberry Farmer | Originally Aired on February 5, 2008
Mike Rowe gets dirty making hand made bricks in South Carolina and then masters the art of cranberry farming in Oregon.

6 – Mud Mineral Excavator | Originally Aired on February 12, 2008
Mike Rowe gets dirty in Death Valley preparing for a gem and mineral show, helps save injured birds from a salt lake and then gets dirty working at a rice plantation in South Carolina.

7 – Tight Spaces | Originally Aired on February 19, 2008
Mike Rowe looks back at some of his dirtiest and most challenging jobs ever – the jobs that required him to get dirty while squeezing into unbelievably tight spaces.

8 – Brown Plate Special | Originally Aired on February 26, 2008
Mike Rowe looks back at memorable jobs that required him to get dirty while making some of America’s favorite foods. This special episode includes never before seen footage, and a countdown of the Top Ten most disgusting things Mike’s ever eaten.

9 – Dirty Jobs of the Big Apple | Originally Aired on April 14, 2008
For this episode, Mike rolls up his sleeves and gets dirty with a New York company that specializes in building and replacing water tanks that supply water to some of New York’s biggest buildings. These water tanks sit on top of most of the city’s buildings and are necessary to supply water to upper flows since New York’s water pressure is only strong enough to reach the fifth floor. Mike learns quickly that this is a very dirty and dangerous job as he finds himself in precarious situations several hundred feet in the air. After completing the dirty job of demolishing the old water tank, it’s time to bring the new lumber up the building’s elevator so construction on the new tank can begin. It’s a dirty job that’s vital in keeping New York City in constant supply of running water.

10 – Floating Fish Factory | Originally Aired on April 21, 2008
In this special Dirty Jobs episode, Mike travels to the great state of Alaska for an epic adventure aboard a fish processing ship. He gains a new appreciation for the men and women who get dirty to put fresh fish on our dinner table.

11 – Dairy Cow Midwife | Originally Aired on April 28, 2008
Inside an Indiana dairy farm, Mike learns how to milk a cow and use a blow torch to clean her udders. Then, Mike gets the inside scoop on how to inseminate a cow. Finally, Mike gets an up-close look at fatherhood as he helps deliver baby calves.

12 – Aerial Tram Greaser | Originally Aired on May 5, 2008
Mike Rowe heads to the site of a future California neighborhood where he learns that there’s more to erosion control than one might think. Then Mike gets a bird’s eye view of Palm Springs as he helps maintain and repair the tram 8,500 feet above the city.

13 – Turkey Inseminator | Originally Aired on May 12, 2008
Mike crawls through rat drops, falling insulation, and debris to make a house more energy efficient. Then, he visits a turkey farm where a bunch of large-breasted birds are inseminated.

14 – Ice Salvage Crew | Originally Aired on May 19, 2008
Mike Rowe gets dirty in Alaska as he helps protect the environment by cleaning up an oil spill and then travels to Minnesota where he works to pull a car out of a lake that has fallen through the ice.

15 – Wind Farm Technician | Originally Aired on June 2, 2008
Mike Rowe heads to an Oklahoma wind farm and learns that going green sometimes means you’ve got to get brown first. Then he heads to Kentucky to clean out a sink hole that some have unfortunately turned into a garbage dump.

16 – Animal Barber | Originally Aired on June 9, 2008
Mike Rowe and the Dirty Jobs crew travel to the Spring Brook Ranch in Kalispell, Montana to join forces with a yak and bison rancher who put him to work in his 150th Dirty Job. It’s a celebration of dirt as Mike and the crew go to work.

17 – Brown Before Green | Originally Aired on June 16, 2008
Mike looks back on several of the Dirty Jobs that help to clean up the environment. From geothermal drilling, to wood and tire salvage, to building cobb homes one thing seemed constant: In order to be green, you usually have to get brown first.

18 – Greenland Shark Quest | Originally Aired on July 29, 2008
In this special episode of Dirty Jobs Mike heads to the edge of the Arctic Circle, on the northeast side of Canada’s Baffin Island in search of one of the most mysterious sharks known to man: the Greenland shark.

19 – Tar Rigger | Originally Aired on October 7, 2008
Mike heads to San Diego to get dirty with the tar rigging crew of the Star of India, the oldest active merchant ship in the world. Then, Mike takes a look back at some of the dirty tools he’s used that make civilized life possible for the rest of us.

20 – Dirty Chip Maker | Originally Aired on October 14, 2008
Mike heads to the Dirty Potato Chips factory and learns how potato chips are made and what it takes to keep the machines used to make them clean and in working order. Then it’s off to Rifle, CO where Mike attempts to clean a “monster” hidden underground.

21 – Sheep Castrator | Originally Aired on October 21, 2008
Mike works at an automobile dealership where the job is sawing down a giant concrete wall to make room for a new wash bay, then heads to a sheep farm where he tries his hand at sheep shearing & castrating before getting treated to Rocky Mountain Oysters.

22 – Leech Trapper | Originally Aired on October 28, 2008
Mike teams up with the boys from Bartos Bait & Fish to catch leeches that will later be sold for fish bait. Then it’s off to the Green Tripe factory in Hollister, CA where Mike helps make BARF (Biologically Appropriate Raw Food) for dogs.

23 – Dirtiest Presidents | Originally Aired on November 04, 2008
Mike Rowe takes a look at some of the dirtiest jobs in America and discovers that many of our former Presidents had dirty jobs themselves. This Dirty Jobs Extravaganza will have you seeing our country’s history in a completely new – and dirty – way.

24 – Mannequin Factory | Originally Aired on November 11, 2008
Mike finds himself at the Windsorland Mobile Home Park where homes are being broken down to make room for a new shopping center, then he heads off to Patina-V where he learns that making mannequins is not only a dirty job, but a form of art as well.

25 – Egg Farm | Originally Aired on November 18, 2008
Mike visits a Chicken Farm to see how eggs make it to the store. There, he finds out that 1.4 million chickens equal a lot of poo, which he gets the chance to clean. Later, Mike learns how dirty dirt becomes clean dirt as he sterilizes soil in Oklahoma.

26 – Vellum Maker | Originally Aired on November 25, 2008
Mike travels to Yakama, Washington to harvest hops, the main ingredient in beer. From there Mike goes to the Hudson Valley where he turns animal hides in to paper.

27 – Maggot Farmer | Originally Aired on December 02, 2008
Mike travels to Congress, Arizona, to try his hand at moving a giant cactus before a storm comes in. Then Mike heads to Idaho where he visits a special kind of farm, one that raises maggots.

28 – Gourd Maker | Originally Aired on December 09, 2008
Mike travels to the middle of Connecticut to clean out a lake, then drops by a gourd farm in Pennsylvania and transforms gourds into a variety of products.

29 – Brown Before Green 2 | Originally Aired on December 16, 2008
Mike takes a look back at some of his former coworkers who should be role models for the green movement. Includes: Chinatown Garbage Collector, Airport Maintenance Worker, Cave Cleanup, Barge Demolition, and Heating Oil Tank Removal among others.