How Do You Clean Your CD's?

I would never recommend using any "windex" type products. These contain various chemicals & additives that could damage the surface, or, at the least, leave a film of some kind. I use the smallest pin drop of dishwashing liquid (only clear kinds, NOT Dove), after wetting the disc with water, preferably distilled. If the disc is wet, carefully & lightly using a smooth fingertip will not incur any friction or scratches on the surface. If you do not have smooth & soft fingertips, I would use a soft, lint-free cotton fabric very carefully. And as others have pointed out, cleaning motion should be in a radial motion only, not in the direction of the "grooves". Rinse well with tap water, followed by a final rinse with distilled water. Then gently blot the water with a soft, cotton terry cloth, taking care not to drag it across the whole disc.