I have a kit, comes with a mini hand buffer, some polish, a chmois leather and a soft cloth, and one other magical ingredient a solvent which dissolves plastic at a slow rate. you apply a little of the solvent, you then wipe it all over the disc, leave it for 1 minute, then properly rub it into the disc from the inside edge to the outside edge, once all the solvent is applied and the disc is clear you apply the polish. polish the disc up and it's good to go. Cost me 5 gbp. from Maplin. Never ever had a problem with it, the stuff is is wonderful. Oh and no CD is unreapearable unless it's a) cracked or b) scratched on the metal. If you've scratched the metal then the CD is buggered.
Saint Del is considered a holy healer of diseases of children, but also as a protector of cattle.