Thanks for your comment. In fact, in Dec 2013,when I first posted my "melted dust into the sensor", I had no idea that there was a known effort to get Leica to accept a flaw in the design/construction of the M9. I thought it was my fault for not caring for the camera (although I do care). Finally, and thanks to the Leica Forum, I found out that it was a Leica flaw. I sent the camera, they agreed and changed the sensor and CLA my camera. I am very thankful. I do clean my Canon, Pentax sensors, but I hesitated to clean the Leica because of the warranty. As it turned out, it was not "melting" dust onto the sensor. Although, it looked that way. It was a corrosion from within the sensor and the cover. In any case. My M9 was good then, and is good now. I intent to keep is as log as I live. It is one of the best cameras, second only to my M8.2. 😉