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In a word – prevent.
Simply put, cleaning those sensitive sensors will always be both costly and time-consuming, not to mention running the risk of scratching it while performing the task.
I have lately been adopting the following techniques to greatly reduce this unavoidable problem, and it seems to be working
- Use only prime lens (ie. fixed focal length glass) whenever possible. I find all my three 50mm lens perfect in most scenario.
- Point your zoom lens downward when retracting the lens barrel slowly
- Lock your lens (applicable for lens like Nikkor 28-300mm VR or Nikkor 18-300mm VR) to prevent lens creep which indirectly increases the frequency to retract your lens
- Acquire lens that do not extend or retract with zooming (ie. Nikkor 70-200mm F/4 VR III)
- Change lens only in your hotel or home, never in an outdoor environment
- Get your pro glass regularly serviced to replace ass rubber gasket and seal every 3 years