I have never used any liquids to clean my CD lens, however will admit that I do use my vacuum cleaner nozzle → a careful non touching sweep around the tray, then holding it steady and very tightly about 40mm above the lens for about 10 seconds. My thinking is that doing it this way avoids pulling more dust and debris towards it before cleaning.
NOTE Please do not attempt to do this yourself unless you very are confident in success, otherwise you risk possible damage to your player!
And do always make sure there is a grown up with you! 
Still have mine…. Hmmm. Will give it a whirl for sure!! 
That’s hilarious dude
From the ‘brochure’ (manual!):
‘9.4 Player Maintenance
It is important for reliable operation of the CDX2 to ensure
that the surfaces of the transport platter and the underside
of the puck are free of dust or debris which can prevent the
disc from sitting properly and cause it to slip.
To clean the transport platter, take a piece of Blu-Tack and
lightly apply it to the top surface of the magnetic metal hub,
picking up any material attached to it. Brush the plastic
outer edge lightly with your finger or a soft brush to ensure
that it is dust and particle free. Similarly, clean the puck
with Blu-Tack, to remove debris from its underside. Do not,
under any circumstances, use any solvents or fluids for the
cleaning process.’
Thanks, yes that sounds very familiar from our past Naim players. No mention of cleaning the lens and definitely no fluids. I’ve never done so since, even though we don’t have a Naim player anymore.
Cocteau twins and David Sylvian very good on Naim 