My hardest worked 1Ds MkIII has more S___ in the viewfinder than the African savannah after the wildebeest migration. I wouldn't dream of cleaning it, it works. Next time something on it breaks it can go to Canon and if they clean it, great.
I understand the "collectors" mentality for bespoke items like limited edition Leica's, but to try to do that to simple workers tools seems a bit strange to me; these things are not built in dust proof clean rooms, they are not collectables, in fact they are nothing special at all in and of themselves, they are tools that enable us to take amazing images.
Worry about the colour of your output images, worry about lighting, worry about AF, exposure, or any number of important things, don't worry about a spec of dust in the camera, a scratch on the paint, a broken catch or seal, it is nothing more than a tool to take your great images.