The issue here is that you could clean the place up, write a new description and then we have to re-set that description to the old dirty one after a month. that's GM cycles that we can't really spare.
The alternative is to make room descriptions that have stages: IE: clean, sort of clean, dirty, very dirty.
Which means we need like 5 different descriptions of a single room. Even if we only did this for certain rooms, the amount of time + effort that would go into the code to make this possible and then the different descriptions, and then the code to clean the room... all to enable you to type a 'clean' command over and over once a week?
Just doesn't sound like something that would increase RP. It would just make the job more tedious. Also, as was pointed out before, this is Red. It's supposed to be dirty. No matter how much you clean, the fact of the matter is that thousands of unwashed half starved -dirty- people go through Fuller Med each day. You are thinking of it as this empty, cleanable place. It's wall to wall people in there 24/7. The entire mix is. Ever tried cleaning a place that is wall to wall people? Pretty difficult and definitely a losing battle.