Disc Cleaning

Not quite sure where to put this, but I figured here would be fine...

I recently found some old PSX games (without their cases, of course), and they're quite filthy. They're covered in dust as well as whatever the hell else has accumulated over the years on them. Are there any good "cleaning methods" for cleaning discs? I'm quite paranoid about scratching up the discs more than they already are, so, I don't want to screw around and experiment with anything (Toothpaste? You're shitting me). Is there anything I should avoid using, and anything you've found effective for cleaning shit off your discs?

I'm also looking for any products that fill scratches on discs, as well, if anyone has any ideas for that. Google wasn't too helpful with either of these -- rather, I found some questionable methods.

Jam it back in, in the dark.