I have other rubber stuff developing some 'juice' and I discovered a way to fix it is to talc it.. but I don't think I'd want to do that on a camera. ;p
I recently noticed the same thing happening for my D70; sticky handgrip, CF cover.
Does anyone know whether the price has increased for the replacement? And whether the turn-around time is about 3 days (assuming they have stock for all parts to be replaced).