I have a Rega Apollo cdp and have used a cleaning CD (the one's with little brushes) to clean the lens a couple of times. The owners manual states "do not attempt to clean the lens, it should not need any servicing." The dealer where I bought it said the cleaning CD would be ok, but I don't know. What do you guy's think? I did a search but couldn't find any posts.
Question is - why do you think it needs cleaning? Unless it's in a smokey atmosphere it shouldn't need cleaning and what ain't broke don't need fixing. That said, if it is in a smokey atmosphere, then occasional cleaning may be beneficial.
the thing to bear in mind is that cleaning is always an abrasive process to a greater or lesser degree. You have a lens there. Any brushing is a low amount of scrubbing, any liquid cleaner is designed to help that process to remove any grunge. unfortunately it can attack the coating on the lens. the liquid will be a very mild detergent but it will have its effect over time.
Me personally? I wouldn't do it. but if you're in a smokey atmosphere, perhaps it's worth doing once every 3 months or so.