Keeping Things Clean
To clean your lens glass, a lens cloth works fine for minor marks like a finger smudge. For more intense jobs, first blow the glass element off (with canned air or a bulb blower) so that there is no harsh particles like sand or dust on it- it could scratch the glass during the next step if it's not first removed. Then, take a Q-tip with some Windex on the tip and gently wipe the glass in a circular motion, and then dry it with the other dry end of the Q-tip.
If you have a dirty sensor, you can take either of these approaches: 1) send it to our Repair Center for a professional clean, or 2) purchase an at-home sensor cleaning kit available HERE. Our Repair Center also offers preventive maintenance on all 35mm, digital SLR cameras & camcorders. The preventive maintenance includes: cleaning inside & outside of the body, replacing light seals, checking all functions (including meter, lens, circuitry, etc.) make any minor calibrations, & we will also clean the sensor on digital cameras.