Hello. Jut attained my first minor dust blob. (I think) It is only noticeable on very dark scenes so at present I am not bothered by it. In fact I only spotted it by chance when I had the shutter on. I would like to plan a cleaning session so can anyone advise me what to do and where to buy a can of chemical free air? I followed Panasonics filter cleaning advice a couple of weeks ago, and I have 140 hours on my unit. I presume that I would need to remove the case in order to clear the panels. Any advice appreciated. Thanks, (I regularly dust the lens so not on the exterior of the unit) Cap.