jerryc41 wrote:
Getting to the dust is often the difficult part. Online suggestions include using a Rocket Blower, but getting that air inside the viewfinder can be difficult. You don't want to make the situation worse. I'm sure I have dust inside my viewfinders, but I just ignore it. Sending it away for a thorough cleaning would be an expensive solution.
The relevant surfaces of the viewfinder are fortunately easily fully accessible on the 6D. Last of that breed tho :-(