I've been washing my pads in the washing machine more and more (basically because I was lazy)...I used to pressure rinse them out with a hose and would use dawn and APC to for my cleaner. But I've found the washing machine (front loader) is doing a much better job than when I do it by hand - when I use pads after I've hand washed them, there always seems to be residual dust within the pad, but when I use machine washed pads...no dust. And I've washed some of my P2s 40 or 50 times now with now visible wear.