i never use them, when i had to clean lens of anything i would always take it apart and use lint free cloth and isopropyl alcohol.
I have always been careful with the disc's i put in any drive i own, i always examine them for grease, fingerprints and clean them b4 inserting them into any hardware i have.
Was told years ago by engineer not to use CD cleaners (the disc kind as they are abrasive) in my at the time 450 quid multi changer Cd player and single player, maybe the CD cleaners now are more appropriate to use.
it also is verifying all images written and can read any disc iso i have at great speed. strange
busy wrting another of the verbs from US in liteon 1635s now
written/scanned on 1635s
then scanned on what seems to be a knackered or in need of cleaning 160p6s
These are the verbs from US, so they appear to be ok, though tbh the first pack of 20 i opened have scratches on them and seem to be not as well made as the /uk verbs i have, have not opened the other 2 packs of 20 yet
ANOTHER EDIT
Not sure what to think of this 1st packet of verbs now just wrote one in my brand new benq dw1670 then scanned it in liteon 1635s and it's terrible, cannot be all my writers/readers, unless of course my new benq hates, or rather the firmware is not very good for dual layer burning /2nd layer it falls apart 1st layer is stunning 99.10 % saying as the liteon 1635s was scanning fine before