I do it randomly as I feel I must. I try to get to it after I finish the last project but I'm always so anxious to start the next one it seems that it doesn't always happen. For me I have my ongoing filing issues that shares space with my quilting books and scissors which seems like never gets caught up so right now I have a paper mess in that area. And I need to pick up all the unusable scraps that will fill dog beds etc so right now I'm in the middle of the 'clean because I must' time. Thanks a lot for reminding me (ugh).