These images show the effectiveness of Arctic Butterfly sensor brush in cleaning my dirty 1Ds sensor.
Only a couple of swipes on the sensor with the previously static-charged brush. No liquids or canned-air.
The dust is almost completely gone, though there's still a couple of big smeared halos of unknown nature wich I have to remove with some cleaning liquid fluid...
You can read more about Arctic Butterfly here http://www.VisibleDust.com