I use a CD lenz brush-cleaning disc from Audio Source. Can't say that it improves the sound when no problems are otherwise apparent. But there was one time when the laser lenz must have been dust-contaminated because some discs were skipping a bit, so I used the cleaning disc. That time it fixed the skipping problem, so for about $35 (I think it was) the Audio Source was worthwhile having around. Now I probably run it about 2X a year just as a preventive measure.
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