Hm... for some reason, I always thought house elves picked clothes up for their masters to do the laundry too (don't tell me Lucius does the laundry!). Haha. But I always thought Sirius is a bit OC about cleanliness. He was all, 'There's enough filth in my robes' to Peter, and there was his little joke about how the house was getting filthy to Kreacher in OotP. :P