We have a thread anchored in the top of this forum that describes cleaning. I very rarely need anything more than a blower for cleaning. There may be a little dust on any sensor, but I think once the initial noise has settled, the dust issue has subsided.
I have a D600 and have had it since the first week of release. I have more than 5000 frames under all conditions with lots of lens changes. Its a non issue for me. Just be sure you have a blower for occasional cleaning.