One thing that did piss me off as aircrew was cleaning the sodding oven liner. True it could be wiped down when cool but it could only be cleaned properly with oven cleaner.
Naturally we did not fly with oven cleaner and had to scrape the damn thing with dinghy knives and wipe with kim wipe.
Elsan's got very technical. Remember each linney got paid an extra 50p per day that he emptied the elsan but you could not just shove it down the drain.
Pee tubes in the Vs were pure bliss. By convention the aircrew used one end and we hoped the groundcrew used the other. By that I mean we simply poured the contents out the top and left it on the nose wheel to drain and cook in the sun <g>. Who knows what it did for the tyres?