Dust on 350D viewfinder

Hi,
I noticed theres's a dust when I look through my 350D's viewfinder. I tried replacing the len's and cleaning the viewfinder but the dust is still there. The dust doesn't show up on the pictures taken. Anybody have an idea where could this dust be? I'm sending my camera tomorrow to canon for cleaning. I would want to try to clean it myself but I haven't tried it yet.

Thanks!
-randal

Try checking out your mirror. If the dust doesn't show on your pictures, that would be a good place to look.

The dust is on the focus screen. The white screen inside the top with the focus points.

Try a blower to remove it, with the open camera body facing down. Don't blow with your mouth.

Saw the dust. Its on the focus screen as Eric said. Thanks everyone!