When I look through my viewfinder, I see a few random spots of dirt. I know it's in the camera body because this happens with every lens I use. There have been no stray marks in my photos, so I haven't really worried about it too much. I've tried cleaning off the outside of the viewfinder, and no change. The mirror appears to be clean, so it must be inside the body somewhere. Does anyone have any advice on how to clean this out or if I should even bother? Like I mentioned, it's not in any of my photos, so there's no loss in image quality. It seems like the negatives would far outweigh the positives in any attempt to clean that out.