One of my dirtier jobs, as I've had a couple, was packing house goods for moving families.
It doesn't seem that bad, but people leave their trash and rotten food around the house and instruct you to pack it with their clothes, aesthetic things, etc, etc.
I once packed a house with three cats, two dogs, and eight children. I'm pretty confident in saying the floor hadn't been cleaned of animal excriement or other things since the birth of the eldest child.
The second worst experience in the same job was packing a partially burned house. A fire had damaged the whole second story (of a two story building) and we, the packers, were sent up there to take care of everything that hadn't been turned to ash. It was water logged, there was no ventilation as the room had to be boarded up because most of the outside wall was gone, there was no running water for bathrooms.
We couldn't go too far into one of the rooms because some of the floor had been completely burned away, and working in pitch black we weren't quite sure where exactly the floor stopped.
It was awful because we, as a company, didn't carry any kind of gloves or face masks. Yay lung cancer! The top floor of the house took over three hours to pack, that's not including the bottom floor that had been water bogged from the attempts to save the top story.