In my office, standard issue company mugs are provided for use and are the cleaners empty/load/unload them from the dishwasher as part of their duties. People also use their own mugs which the cleaners also deal with.
I wash my own mug because I am bit precious about my stuff being misappropriated, and I just went to do this and someone has left their dirty lunch bowl and fork with their remains of their salad on the sink, presumably to be dealt with by the cleaners. It is highly unlikely they are coming back to wash it themselves because I work later than everyone else, so they have all finished.
AIBU to think that's a bit cheeky? The cleaners are not our servants and are not here to wait on us hand and foot.