What do you use to clean your DVD's when they won't play?

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I use childrens Crest toothpast to clean my grandaughter's DVD's with. They get where they won't play, they will skip or freeze up. So, I put some of the toothpast on it and rub it in and then wipe it off with a soft cloth. It works. The scratches are still there but at least it plays and she is able to watch it. I was using alcohol but it was not doing the trick of some of them. Any other ideas? What do you use?