Since as early as 2010, users have reported issues with "spots on the sensor" of their Leica M9 cameras (which only came out the previous year on September 9, 2009 - 9/9/9). While this is nothing new when it comes to digital photography, these "spots" seem to be of a more nefarious origin... So-called "corrosion of the sensor cover glass" as explained by Leica Camera AG marketing person J.J. Viau. There also seems to be some confusion or misinformation regarding the cleaning of these sensors. The impact is far-reaching, affecting the Leica M9, M9-P, M-E and M Monochrom cameras - the former two are now discontinued, but the latter two are still in production - and all use the same sensor, more or less. The message seems to be, whether or not you're wet cleaning your sensors - you could be on your own. Read more below for details and updates!