Asked by photokismet
As a NPS member, I do send it in to Nikon annually for skin replacement (i.e. rubber grips, doors etc.) to keep the gears performing at their best. All seals are also replace once every two years on my own expense. Sensor cleaning is free for us and can be done anytime of the year.
On trips, I uses both wet (for persistent oil/dust stains) and dry (for basic dust blobs) cleaning solutions for the sensor and often find it necessary to pack them in the bag. Cleaning the sensor yourself is pretty simple and less daunting than it sounds. Key to doing this right is the use of firm one-direction swipe actions. I strongly recommend the Arctic Butterfly to you for on-the-fly dry cleaning and VDust Plus.