I have several janitors in my prison, and they spend the majority of their time mopping up blood and urine (unsung heroes of the correctional system, no doubt) and doing laundry. They do not, however, go into the prisoner's cells to do any mopping. They of course will not go in while the cell is occupied, but even when the prisoners are eating or in the yard, directing a janitor to clean a particular cell just results in them leaving and doing other things. Many of my prisoners are complaining about Environment, which from what I read is almost entirely (if not entirely) related to how clean their current area is. This one guy's cell is so full of urine and feces, he's pretty upset. (Why he can't think it's his own damn fault is beyond me, but then again I don't understand the criminal mind.) His toilet is in full working order, and has been checked for tunnels. At least I could understand if his toilet was a facade and he had to take a crap elsewhere, but alas, that is not the case here.
Is there any way to force a janitor to clean a cell, or better yet, a team of janitors to clean an entire cell block while it's empty? I'd prefer not to have to dezone the cells, but if that's what it takes once every couple weeks, I'm not above doing that. (It'd be a last resort, if it even works, that is.)