I'm not sure how fingerpints on CD can dirty lens, but it's easy to show your friend how to handle CD.
When I visit my friends I never touch their stereo or TV or VCR for the same reson that I don't open their drawers or refigirator but if my guest wants to set music himself I will show him how and politely instruct him not to turn volume knob beyond certain point (and explain why) if there is no sound. My 4 year old daughter was operating my TT doing better job than I did (being more carefull) - it's not rocket science folks.
When I visit my friends I never touch their stereo or TV or VCR for the same reson that I don't open their drawers or refigirator but if my guest wants to set music himself I will show him how and politely instruct him not to turn volume knob beyond certain point (and explain why) if there is no sound. My 4 year old daughter was operating my TT doing better job than I did (being more carefull) - it's not rocket science folks.

