My second D600 is being returned to Adorama for sensor dust issues.
I'm requesting a refund this time and will wait for Nikon to resolve this issue.
Yes, I agree that we all should know how to effectively clean our sensors but this seems to be a problem of defective nature. If there is a gap around the shutter, then the dust problems continue on and on.
This is an awesome camera. I love Nikon products and am putting my faith in them to resolve this issue!