Originally posted by ehrwien Having read reviews from people who said that it left some residue on the glass, I would never get close to my lenses with one, least of all a sensor. The right tool for the right job - sensor swabs that are suitable for the sensor size you have.
I have the same experience with them. I tried the pen on lenses, and not only it was not really effective (compared to regular wet cleaning), but I spotted carbon particle on the lens afterwards. While I could easily throw them away with a blower, I would never use such a thing for a sensor, inside a camera, when those same particle could do invisible damage to my camera. Sensor swabs, on the other hand, are perfect for sensor cleaning, I never had any issue with them and they're cheap.