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When cleaning the sensor, try to perform the cleaning operation in a clean environment. I.e do it indoors, close all windows, and shut the room door to avoid draughts. Think about how you position the camera while you are cleaning. It is easily possible to re-contaminate the sensor while you are cleaning. For example you need to look into the camera to see what you are cleaning, allowing skin particles, dandruff etc. to fall into the camera as you clean. If in doubt, use our portable, clean air bag system to ensure maximum cleanliness.