From Harry Pearson, The Absolute Sound:

“There are, to be sure, several other competing CD cleaners available and all are less expensive
than this platinum-priced fluid. But in comparison with others, this European import can make the ordinary
compact disc sound much more musical, with better highs and less “digititis.” That is, its designers theorize,
because the chemicals help focus the laser beam more precisely, without the scattering smear when the beam hits
an ordinary disc. The gain in that right kind of sweetness is its most impressive attribute. Now, if it’s
spectacularity you’re after, the Optrix CD cleaner will do the job, and it’s about five times less expensive. You ask:
Why do I need this sort of thing? Because a thorough cleaning (three sprays three times on the music side of the
disc, once more on the label side to discharge static electricity, wipe dry with a soft cloth is the ritual and
maddening for me) improves the sound. Not sure how long an application lasts; with the Optrix, perhaps a dozen
or so plays. But you can wash the stuff off if you’re in the mood to do some A/B testing of your own with the
various fluids, as we have. Still, this L’Art du Son is the one to have if you must have (and can afford) the best.”