said by jjoshua:An old (clean) t-shirt sprayed with windex will do just fine. You're going to have to try hard to scratch the glass. Just don't push too hard or you can break the zoom mechanism.
I know that you never use Windex (or any other cleaner that contains ammonia) on TVs or computer monitors as it will eventually strip the glare coating off... don't camera lenses (at least some) have a coating that may be damaged by harsh chemicals also?
Personally I'd recommend Endust for Electronics. It's safe for all electronics including screens and also has the advantage of adding an anti-static coating to help keep dust off. You can get it at Walmart etc.