I'm sure you just mistyped, B. Your mirror doesn't do much besides redirecting the image into your viewfinder. If it's dirty, you won't see it on the images taken, but on the image you're seeing through your viewfinder.
Any sensor dust I've encountered on any of my Nikon bodies has been relatively easy to remove. Put the camera into mirror up mode for cleaning, then holding it with the hole facing downward, aim a rocket blower to blow upward into the cavity, being careful not to let the tip touch the sensor (you really shouldn't even need to put the blower tip into the cavity at all). Give it a couple six or eight good powerful shots of air, then mount a freshly-cleaned lens onto the body and give it a shot again. I check mine by shooting a clean white wall with a flash and I stop the aperture down as far as it will go. If you've still got dust spots, repeat the above until they're gone. If any of them are stubborn, you'll probably have to take it in to a Nikon-authorized service center for a sensor cleaning...unless you're brave enough to try one of the wet-cleaning systems out there.
I'm not.