Read the manual

Dig out the manual--you know, the thick book that came with the camera. Although most dSLRs operate on the same basic principles, every camera has its own way of working, and you need to know how your camera likes to be cleaned. On our battered Canon EOS 30D, the cleaning mode is easy to find.

Your dSLR will have a sensor cleaning mode. This involves locking the shutter open to gain access to the sensor. It is very important that you know how this works as a shutter mishap while you're fiddling about inside the camera could have disastrous consequences. Go read that manual.

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