Re-surfacing CDs so they work again.
Use this guide at your own risk. Resurface bad optical media to the point where it might be recovered and burned to a new disc.
I have a manual "Skip-Doctor" and I use it when needed. I thought the discussion about chemical compounds was interesting. Brasso was the focus of the main topic. I thought using toothpaste was an interesting suggestion, as well as the suggestion to use commercial plastic cleaners, including chemicals meant for cleaning clear plastic windows (ala Jeep Wrangler soft top).