I wonder if getting everyone to agree to use Beeminder could help with the cleanliness. When I lived in a group house I found that my mate whom I shared a bathroom with had a significantly lower dirtiness threshold than I did. I don't consider myself particularly disgusting & never even noticed the bathroom was getting dirty, but it drove him crazy. I didn't want to be a dick & never clean the bathroom, but I never cleaned the bathroom because he ended up flipping out & doing it himself. I probably would've agreed to using Beeminder or some other similar system to help motivate me, had I known about these kinds of things at the time.