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Rendering plant worker - This is where waste animal products end up. Can you imagine the smell?

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Portable toilet cleaner - If you've ever been to a large event were these are used, you know how gross they can get. But someone has to clean them.

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Rat breeder - They might be a pest in some places, but science needs them too, so someone has to take care of the breeding.

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Fetal pig preserver - Someone has to preserve them so they can then be dissected by students.

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Roadkill removal technician - Depending on the area, sometimes these workers have to deal with some large animals in addition to the traffic on the road.

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Sewer inspector - Well, you know what goes through the sewage system, right?

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Medical waste disposal - This one is both gross and dangerous. Can you imagine the amount of disgusting things these professionals have to handle every day?

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Pet food tester - Yes, people are paid to do this. It might be a bit gross sometimes, but at least it's just food.

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Semen collector - Giving bulls a "helping hand" might not sound very appealing, but some people make a living doing it.

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Deer urine collector - Deer pee is used for hunting and it's actually big business.

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Maggot farmer - If the thought of maggots is revolting, imagine having to work with thousands of them!

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Fart smeller - The smell of your farts can indicate a number of health issues, so professional fart smellers are actually a thing!

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Proctologist - This "backside doctor" specializes in conditions of the colon and rectum, among others. 

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Armpit sniffer - Have you ever wondered how deodorant companies test their products? Here's one of their methods.

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Embalmer - The art of preserving dead bodies is an ancient one. Though it still sends shivers down many people's spines. 

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Crime scene cleaner - Once all the forensic investigators are done with their job, someone has to clean up the mess.

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Forensic Entomologist - Bugs are essential in determining how long a person has been dead. These professionals come in handy during criminal investigations.

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Hazmat Diver - Imagine diving into the dirtiest contaminated water, filled with all sorts of trash, where you risk catching a number of diseases.

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Vomit collector - Many amusement parks with roller coasters have people that specialize in this stomach-churning task.

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Manure inspector - This is basically someone who examines farm animals' feces. 

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Slaughterhouse worker - It can get pretty gory in slaughterhouses. And being surrounded by dead animals every day doesn't sound great either.

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Podiatrist - These professionals have to deal with people suffering from a number of different foot problems, from ingrown toenails to fungus.

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Landfill worker - Operating machinery in a landfill might sound somewhat fun, if it wasn't for the fact that you'd be moving piles of (potentially dangerous) garbage.

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Chimney sweep - Historically, one of the dirtiest jobs in the world. Despite technological advancements, it can still get pretty dirty.

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Garbage collector - Another classic. Handling garbage is never a pleasant experience.

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Chicken sex*r - One of the techniques a chicken sex*r uses is to check a chick's "rear" to determine whether it's male or female.

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Septic tank repair - When a septic tank is broken, someone has to fix it.

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Pathologist -

These professionals look at causes and effects of diseases and injuries. They play an important role in autopsies.

See also: Grimy and scary jobs that will make you appreciate yours.

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