Nikon D300 Dirty focusing screen

[kingbling11]

I have been noticing recently a lot of dirt through the viewfinder of my camera that has not been showing up in photos. It hasnt really bothered me untill now when it has got completley filthy. I have tried cleaning the mirrors before but some of the dirt still remains. Could it be on the focusing screen? If so is there any way to clean it like i know there is in a Canon?

Thanks in advance

 

[Cheng]

If the dirt's not on the mirror then it'll probably be on the prism - a nice strong airblower should do the trick for the majority of the dirt! The prism is directly above the mirror.

 

[bigNeil]

Common for dust to get on the back face of the pentaprism and the only way I know of to remove it is to pay £30 to a service agent, who even then doesn't guarantee to get them off. Using a blower usually puts more dust up there IMHO.