Hi Everyone, I have a Siemens NCDC 2013 fitted to my Vectra. The 4 change unit has started to say that there are errors on the CDs when it tries to play them. Sometimes it will play the same CDs without complaining, so I think it is the unit rather than the CDs. I wanted to try to clean the laser, to see if that is the cause of the problem. Is it possible to clean the laser in these with a cotton bud without taking the unit out of the car? Do laser cleaning disks work? Has anyone else had this problem? Could it be something else?