I have a D1X but the principle is the same. I have cleaned using the cable release with no problem. Moose Peterson recommends doing it this way. Thom Hogan on the other hand says it's a bad thing. It is hard for me to spend $100 for a gizmo that has only this limited purpose.
Penny wise, pound foolish? Could be, but so far i have no problems but am willing to be convinced.