UPDATE: I have gotten a few emails recently telling me that you should NOT clean your sensor like this. I am told that opening the shutter using B mode charges the sensor and is not good for the camera. So, if you feel this is true then do not use my method! You can always set the M9 to SENSOR CLEAN MODE and do it that way, BUT I will continue to do it the way I show in the video. I have done it like this for 3 years and over 600 times with no ill effects (on the M8 and M9). Besides, why would opening the sensor in B mode have the potential for damage? I use B often when shooting at night. So I have to say it…clean at your own risk! The video I show below is how I do it on a weekly and sometimes daily basis and will continue to do so. The small charge the sensor gets in B mode will NOT attract more dust to the sensor in the 3-4 seconds it takes to blow it.
An alternate way to do this is to use the M9 ”sensor clean” mode in the menu. Just make sure you have a full battery.
Just a video showing how I clean my sensors. I have NEVER done a wet clean as the rocket blower usually gets most of the gunk out. I highly recommend this Rocket Blower if you do not have one! I also believe in the power of YOUTUBE as it makes it easy to show what I am talking about so enjoy!