Ideas for best way to repair scratched cd’s please?

OLC question mark

The thread starts as follows: Hello all. Over the years, I've managed to scratch a few cd's, due to transferring between players, cars, lying around as lots get played on drinking nights etc etc..There are quite a few that are going to be hard or impossible to replace, so I'd like to ask opinions on effective methods / widgets for polishing them up and getting rid of scratches and restoring playability. Thanks for any suggestions, Grahame.