I regularly have to wet-clean my sensor - for the first 18 months or so, I got away with blown air, but as the camera has aged, with frequent use in hostile conditions and having taken some very heavy knocks too, dirt has been shaken around inside the shutterbox, so I now have to wet clean it every 3 or 4 months. I use the Green Clean wet and dry swabs mainly.
It isnt really that hard to do, but it still gives me the willies thinking about the cost of replacing the 1DsII sensor.
The really annoying bit of 'dirt' however isnt on the sensor at all - a midge managed to get itself inside one of my lenses whilst it was attached to the camera last summer, and is occasionally visible in images still!
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