Will Nikon clean my viewfinder?

Will Nikon (or reputable third party) clean dust that has gotten into my viewfinder? I see a dot in the finder above a grid line and I've tried blowing and the bunch, but it won't come out. Also, I can't see it on the fresnel when I peer in. Will Nikon or whomever take the focusing screen out to clean it if I give it to them? Will I have to specify? Anyways, thanks.
Added (1). Just to clarify, the dust doesn't affect my image obviously. But, it does show up completely black. I do not think it is a scratch in the focusing screen. It has the same kind of black color as the frame lines and focus selection.
Added (2). also, will they take a look at it when I send it in just for a general cleaning once in a good while?

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