I just got my Nikon D750 back from service for a faulty live view issue. When I sent the camera off I included a body cap when it was returned they did not include it, just wrapped in plastic. I was worried the camera sensor would be dirty, but it looks OK maybe 2 or 3 spots at f22. But that got me thinking. What is the best way to clean the sensor on the D750, do I need to buy anything special? Or does the clean image sensor menu item do the trick?