I do store them in the case with the mini xlr pointing upward so it doesn't damage the cable. Unfortunately my head isn't always at its cleanest. One can do so much to prevent dirt inside the driver but there is also the driver on the other side, This is a very complicated subject! The least riskiest way to approach this it seems is to let the driver face downward in the case for X amount of hours or days and let gravity do the work. And then remove the pads n clean whatever's fallen off. Or combine with what racebit said, put it face down n play music.