My dirtiest job was in the US NAvy on a submarine. I was assigned to Auxiliary division or "A-gang" and we had to clean the sanitary tanks to replace the tank level indicators. We had to go into the san tanks with air-fed masks and environmental coveralls and pressure wash them. At one point we wrapped our hands around a "six inch" pipe and squeezed only to find out it was the 1/4" gage line we were looking for so, we pushed the poop off the line to clear it enough to blast it and replace it.
I am on the USS Topeka and yes that is 150% true. Us A-Gangers or written A-Division on board are responsible for the Sanitary systems, and seawater systems. There are many other systems but these are the nastiest. We would have a guy in the San tank puking his guts out because and can't stand the sight of poop all around him let alone all over him, or crawling through a bilge underneath our Sanitary Pump the always leaks just to crawl into a Potable Water Tank. You have hair stuck in valves from God Knows What through the system. Taking apart a pipe to see what is clogging the Sanitary Pump. Then you have seawater systems that corrodes metal and smells like fish, it is amazing technology but for us A-Gangers on board US Submarines there is no excuse for procrastinating a job such as this.