I have attempted to clean the sensor on my 20D (blowing it with bulb) and it has just blown the dust into other areas. I even tried tilting the camera so it would help, but nada. I read this article that says you can dab it or wipe it off but I'm a bit skeptical: http://www.earthboundlight.com/phototips/where-is-that-dust.html
I called the local photo store and they want 60 bucks to clean the sensor. Ouch!!!
Here is an example of the spots I am talking about
The shot is before I cleaned it, now the spots are in different places.
Any help or direction would be appreciated.