Here’s what we used:
- Warm water and kitchen roll, dried with micro fibre cloth - fingerprints, smears
- Mr Muscle glass cleaner - more stubborn marks, light scratches
- Baking soda toothpaste - the 10 CD we had covered in scratches
Selection 1 enabled 90% with errors to be ripped, Glass cleaner fixed the other 10% and abrasive treatment was only required on 10 or so CD which were quite badly damaged.
The ones which required surface abrasion didn’t work on our USB CD drive even after polishing but worked in another DVD drive.