The worst is that it works!

But for that matter, as many attempt to clean the lens with a kit like this announcement. A 7 including postage, it does not cost much to try.

What to say? It worked. No problem reading or writing since. Use of Bitonio is childish (it puts the product on the brushes of the CD; you put the CD into the drive; it turns and cleans -> tadah!), And the result is there. :)