Chosen Solution
All images on my Sony RX100 have a spot (dust?) to the right of center. How can we clean the sensor?
@waddie could be dust on the CMOS. The sensor is part of the flex cable which screws on the back of the lens assembly. Remove it and clean it carefully. Let us know if you need more help with this. #60 in the image is the CMOS imager with flex.
This happens because when we change lens then some dust particles come inside of camera. To prevent spots on images you have to clean image sensor of camera. You can clean your camera in 2 ways that is auto cleaning of camera and clean your camera using blower. Check Sony RX100 Manual for detailed view of these both methods.
