Tbg, Have you had a chance to compare the Nespa and RC treatments? The cleaning fluid is another variable here. It would be interesting to compare "copying" with "zapping by light". So, to do an objective comparison, perhaps you can clean the CD and all CDRs with the same fluid and then compare as many of the following as your patience will allow: plain CD, Nespa, RC, Nespa followed by RC, RC followed by Nespa. I found Leec's comparisons very interesting, but I don't recall if he removed the cleaning fluid out of the equation by cleaning all discs first.