Cleaning CD/DVD 's

What is the best way to clean a cd or dvd ??? Soap & water??

Yep

always make sure you wipe it with a clean cloth, from the inside to the outside in straight lines, not in circles.

As found on booklet in DVD:

Clean with damp, lint-free, non abrasive cloth. Do not use harsh cleaning agents. Wipe disk disk using straight motions from inside hole to outer edge.