From the archives here, there was a thread on this recently.
http://forum.audiogon.com/cgi-bin/fr.pl?ddgtl&1038597829&openflup&3&4#3
Not many responses, but those who have tried multiple products seem to favor Walker Audio Vivid by a wide margin.
I've tried Optrix (it doesn't seem to do much for me sonically but is a good cleaner). I've also tried Auric Illuminator (much better and gives a noticeable improvement in the sound of most CDs and SACDs). Auric is actually more impressive on the SACDs but cannot be used on hybrids manufactured by Sonopress.
Walker Audio is next on my agenda. More expensive than the others but supposedly yields a better payoff.