Roland and Bjorn, I've tried the Artist brush but not the vacuum cleaner. I did start with soft cloth, but pretty hard to get it into the tiny crevices . Then I went to very slightly damp Q-tips. I think part of the problems is the heat and humidity I often shoot in. The tiny particles seem to be stuck. I can gently use a straight pin but a pain and need to do it under a magnifying glass . I'll try the vacuum cleaner brush and a slightly stiffer tooth brush. I'll also see what my guys at Nikon did last time. I need to replace that rubber cover part for the connector pins on the D3S anyway.
I have several artist brushes , different sizes, that I try to use on the lenses and bodies when I come in but get lax on that with other things interfering with my time
Interesting conversation with a perspective buyer about working cameras vs occasional hobbyist shooting . A friend, professional underwater photographer, was over the other night
and commented on what good shape the cameras were in but he was not looking at the Macro lens images ... lol
Many thanks and will try the suggestions.
Tom