It this really the place to discuss something as meaningless as cleaning the lense of your cdrom player?
I can only imagine two instances where you might consider cleaning such a delicate piece of hardware:
1) you have a pcmcia drive and you have been fingering the lense to see if you can get your prints on it.
2) you are an intense smoker who smokes 5 packets of the heaviest caliber a day and exhales into the cdrom drive all day.
And in both cases I'd recommend letting someone experienced clean it for you.