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| Re: How clean is a clean sensor? |
One possible reason for water soluble dust and fibers to get stuck on the sensor is taking the camera from a cold ambient temperature into a warm humid ambiance, eventually fogging the sensor and sticking the dust. Of course if you think of that, you can try to avoid the circumstance, however when cleaning you want to use a cleaning fluid that removes water soluble spots, not just a solvent for oily spots.
Further, if you have a sensor loupe and you know you are going into such a cold/war humid situation, you can check the sensor in advance and remove any suspects.