Laser Decrease 5mw Will A Smudge On Cd Burner Laser Lens Decrease Quality Of Disks?

Will a smudge on cd burner laser lens decrease quality of disks? - laser decrease 5mw

So one of my CD does not play, so it throws the disc on my laptop, and changed the CD, so you can see it. When I do that I had the lens of the laser and fat hands to put it on a spot. I read that you should never clean the lens, it is not even with these discs, but I fear that the will of the quality of the discs that I burn to reduce the stain. This is a stain on the lens, the quality of the music, video, image files or burning CD \\ \\ DVD-compromise? If you do not go, how do I clean right?