
Originally Posted by
genghis2510
You can do careful manual cleaning (swabbing) using Dust-Wand on the sensor and screen leading to the viewfinder prism but never, never, touch the flipping mirror. The moving/flipping mirror is the most sensitive among the three. Besides, it's only the dust on the sensor that affects the photo. Dirty mirror and screen affect only viewing.
If you attempt to clean and apply so much pressure on the mirror, it will give way or be misaligned and go kaput. Use blowers instead.