When I have a dirty CD or DVD, I wait until I am going to wash a load of dishes. Then I hand wash the DVD or CD with my fingers in a sink full of new soapy dishwater that hasn't had any dishes added to it yet. When all of the fingerprints or dirt are off, I dry it on a soft, lint-free towel.
By hawthorndarkmoon from Buffalo, MN
This page contains the following solutions.
To take care of DVDs and CDs that have been scratched; instead of buying an expensive kit to fix them, put a little rubbing alcohol on a paper towel and working from the inside of the disc outward.
Keeping in mind that CD's should be cleaned as little as possible, if you'd like remove smudges, apply a little rubbing alcohol to a clean white cotton cloth and wipe it ACROSS the CD. Never use a circular motion when rubbing, as this will create scratches.
Put a little rubbing alcohol on a cotton ball and wipe the disc clean. Air dry.
Removing dried dog urine on your CDs is easy to do. Simply wash them with warm, soapy water and allow to air dry. This is a page about cleaning dog urine off of CDs.