I have a Canon digital SLR camera (eos 350d) and recently I realised there is dirt somewhere inside it. Some of the photos have dirt on them and when I look through the view finder I can see stuff that shouldn’t be there.

The dirt is not on the lenses as it remains when I switch lenses so it is in the camera somewhere (either the mirror or the CCD I presume.

Cleaning the internals of a dSLR sounds like a daunting prospect to me, should it? Anyone got any good tips on how best to clean it?