Don't listen to the person who gave a 1 star. It really does work. I've had my Wii for some time now, and when I was unable to play Red Steel 2 because of a Disc read error, I didn't really know what to do. I went and looked around for a solution, which were either to send it off to Nintendo to fix, or to just DIY with a lens cleaner.
I didn't know which lens cleaner to try, so I just checked play.com if they had one and I got around to finding this little thing. I trust the whole 'Official' accessories Nintendo make for us, as I have a number of top quality items from them for the Wii (including the Officially Licensed Nintendo Speaker System - They are great).
For 6 pounds, I reckon it was worth it. Used it once and wow, I couldn't believe how much dirt was on that white cloth (Too much Super Mario Galaxy I guess), and now, I have no Disc read problems, so really recommend if you guys have this problem.