My worst job ever? Easy. I cleaned a slaughter/butcher shop in the evenings when I was 15. If you could get right in and start it was the best. All the fat and blood hadn't had time to congeal yet. First you had to put on your rubber boots as you started out by wading in up to several inches of slimy fat and liquid blood. Since the floor was an uneven cement slab the goo would puddle up in various places. You could use a large squeegee to push most of the crap on the floor towards the drain. The liquid would go down the drain and the drain trap would catch all of the floating cow and deer pieces and fat tha was starting to set up. Cleaning out the drain trap, that was nasty. If you waited too long, or during the winter when the cement floor was simply cold all the time, everything would start to set up and getting it cleaned off the floor was a nightmare. You also couldn't just wash it down the drain. You had to scoop it all up and dump it in a waste receptacle.
Then there was the refrigerator floor. There was no floor drain so as the blood drained from the freshly butchered carcasses it would gather in large puddles several feet across. As there was no fat in this blood it stayed in it's liquid form. You have to get a mop and simply sop up the blood until it was gone. There were nights when I would dump out several mop buckets full of blood.
Then there was the equipment. You have to disassemble all the saws and grinders, soak everything in hot water and soap, scrub them down, rinse them off and put them back together.
I'll be shocked if anyone can top mine.