I typically clean when I am going to have people over (I'm not sure why, everyone knows I'm a slob, but I'd rather not make them put up with it - okay, I will qualify that with - I'm not dirty dirty, the bathrooms get cleaned regularly, so it's not disgusting, there's just gear or equipment or projects everywhere) or when there is some other task that I really don'twant to do, so I procrastinate by cleaning as an act of desperation.