Patriot, that dust won't affect the picture at all. Most people don't worry about it. There is a mirror up in the top that you don't have access to.
The mirror flips up out of the way. It's straight from the lens to the sensor.
If you have dust in the lens, it probably won't even show up on the shot. I have some small pieces of dust in my lenses and they never show up. The only thing you would want to clean in the front and back of the lens, as well as the sensor. Everything else should be fine. I've had a few on the mirror in the viewfinder, but those don't affect the shot. You can try using some canned air but I doubt it would help