The archives have a number of posts about cleaning, but none that seem to answer basic questions. So, here we go:
My D7K's sensor desperately needs to be cleaned. I am tempted to do it myself, but have heard stories of folks managing to commit sensor-murder during the process. Others say that killing a sensor requires real effort, and that the money on a cleaning kit is far better spent than paying a shop for a cleaning. (I think I saw a post to that effect earlier today, although I am not sure in which thread.) So I am wondering if most folks here clean their own sensors, whether anyone has damaged one doing so, and what kit or supplies folks recommend.