Help Cleaning my D7000

So I bought a D7000 couple of months ago and went to theGirNational ForestinIndiawith it. The conditions were extremely dusty there. Although my sensor didn’t get anything on it because I didn’t change lens while out in the field I see very fine dust all over inside the view finder. I am not able to clean it with a blower because it’s on the inside. I am not sure how it got in since the camera is suppose to be weather sealed but I need advice on how I can clean out my view finder without sending it in for service.

Images I take are not affected by the dust (at least not that I can tell) nor do I see the dust when I look through the view finder, but I do see it when I shine a flashlight into the view finder.

Any advice would be appreciated!

Thanks,

Ken

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CAMERAS :Nikon D7000, Fuji F30
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LENS:Nikon 18-200 VR II, Nikon 35mm F1.8, Tamron 124  F4