If you know anyone with this dust problem....then it's ME. I have literally taken back 7 Canon EOS 3500 Digital Rebel XT's to the store that I bought them, and got a new one each time. The deal is, that new camera always will have dust on them. It's called "Factory Dust". The factories that make these cameras, do not have a personal vacuum to put together the parts and sensor so naturally dust is very liable to enter the sensor and other parts of the camera. Nothing is perfect in life. That is what I was thinking t least later on. At first....I got really scared and upset/worried like you and naturally wound up returning lots of them. I thought...that perhaps they were used before, but there was no solid evidence to support this theory. Then I read an article about Factory dust, and how easy it is for it to make it's way onto the camera while it's in production. What I would do is go and get a "Hurricane Blower", they are pretty cheap, blow a few times for practice and to get the dust out, push it into the sensor area, and squeeze a few times, and that should get the big chunks of Dust off the sensor, and the others, just don't even worry about. Honestly, your not even supposed to tough the sensor with anything, not even a camel hair brush. Methane is possible to clean it off with, but there is a lot of risk being taken, and could end up destroying your camera entirely. And I think you would rather have just some dust on some pictures, rather than just not having a camera at all. So, you can either get a hurricane blower, or just live with it. Factory Dust/Dust is really simply just a fact of life, and nothing is perfect.
