If it's playing CDs fine, and not skipping I'd leave it alone. I view cleaning CD lenses as a last resort, almost as likely to break something as fix it, and I only do it if my players are having problems reading discs.
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I had the same thought the other day. However my conclusion was the same as Sean's: if it ain't broke, why fix it? I am still not sure if it's the best way but this is what I am sticking to for now.
I haven't taken my C333ES apart before but I am surprised the lens wasn't visible. But if that is the case, then chances are it is clean! lol.
I have owned the Sony XA7ES where the lens is fixed to the tray and hence it's accessible when the tray slides out. Whenever the player starts to exhibit serious skipping problems on certain CD's, I've used a dry cotton bud to clean the lens. This method works for me. I believe the dust and/or dirt from CD's have got onto the lens after many years of play that caused the skipping. I'm not as patient as Elizabeth in cleaning every single CD's everytime they go into the player.
You did not mention if you have experienced any problems with your player. If not, as others have mentioned, don't bother to do anything to the player.