Two month old 5D MKII and eight month old 1DsMKIII. Totally shocked by how much dust/fibers etc on the sensor filter and on the mirrors. Thought about using a blower / brush to clean the mirror,(and sensor filter) but I'm very concerned about the partilces simply redistributing in the chamber, then of course settling on the sensor filter on the first mirror flip! Yes, I've read tons of tips for cleaning, blower brush, Sensor swabs with and without flluid, and the Visible Dust sysytem (which I have). I had a terrible experience with Canon service, they trashed my 1DsMkIII when they tried to clean it, actually made it worse, then sent it back and stated it was back to "factory specs". I wanted to vomit, and truthfully, almost did I was so upset. The camera was brand new. They sent a new body after two failed attempts by CPS. Since then, I've tried to remove spots from a 1Ds, with no luck whatsoever. The spots seem to be embedded, and wouldn't budge. Time for an eBay auction, sold that body with no statement of sensor condition, the buyer was happy so I'm just glad to be rid of it. Now, with my 5DMKII and 1DsMKIII developing spots, I'm considering using a modified vaccuum to clean it. Has anyone tried using suction? What I'm thinking of is either one of those computer keyboard vacs, or rigging something such as a modifed tip on a small shop vac. Put the vac in another room, pass the hose through an opening in the wall to prevent dust from the vac entering the air space, using a small tube to reduce the hose tip to a reasonable size (about the diameter of a pencil -1/4"?) Sounds strange right? But has anyone tried this already?