When I lived with some friends in Salt lake City, my flat mates once told me there were scared when I cleaned the bathroom. This always seemed to me outrageous because I could never remember cleaning the bathroom at all. My attitude to cleaning is usually summed up by a quote from Quentin Crisp that the dirt reaches equilibrium, so why bother to clean.
However, at some stage, even I can't stare at flat full of papers. So I have slowly tidied up the last two weeks, so my flat is a bit more ordered. Although no doubt if you were to visit my flat of solitude you could swipe a finger in your while glove over the wall and find some dust (I would then throw you out).
Some people may be thinking -- we clean our house every week, so what is the big deal? Interesting question, as I think I am really cleaning my flat rather than studying for my German exam.