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I clean my Canon 450D sensor, a few times actually. It may not be a dirty sensor but the cover glass ( the anti-alysing filter). If it's the front filter you can clean it without taking the camera apart.
First look at it, you can do this by turning your ISO down low, and setting a manual bulb shot. Activate the shutter and you will be able to see the filters and sensor. Do not shine a torch in there, a red sstro light on low setting is all that I would use. If the first filter is dirty try to blow it off with a puffer first, then a soft lense brush, if its still there try a little acetone (pure) on a soft sensor brush. That should take care of it. Most sensor artifacts in photos are on the outside filter. Good luck.
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