Thanks Nesster, I'll try a rocket blower first down the throat, and if that doesn't work I'll see if I can find a way to get to the viewfinder area better.
Nice clean used D200's are relatively cheap right now, as you say, and I think they are a lot of camera for the money. I have a K10D which I like very much and the D200's ergonomics are similar. I thought about a K-5 but I just don't have any interest in video, and it is a lot more money that I paid for this D200. I don't need 16 MP since I don't intend to print anything real big. I don't shoot in dark places such as bars, jazz clubs, opera houses, etc. Most of my shooting is outside for landscape or wildlife, in decent light so the K10D and D200 will do me just fine.
I only just got the camera Saturday, and it has a Nikkor 18-70mm S lens which has the Silent Wave Motor for auto-focus; the auto-focus is quick and quiet, to say the least. I took it hiking yesterday and played with various settings, I think I will like it a lot, once I get used to the basic operations. It seems to be pretty straightforward, with a lot of primary functions controlled by external buttons, which I like, much like the K10D. I have several nice Tamron Adaptall II lenses that will work with it. I will probably look for a used AF lens in the 50-200mm range to go with the 18-70 and I should be set.
Both the D200 and the K10D are a lot more camera than I am photographer!