It's a cream metal polish with chemical cleaners, and a mild abrasive. It will take a brass item that's turned green and clean it up in a hurry, with just a little rubbing. We used it in the service to keep brass uniform buttons, etc, all shiny. I still keep some around for gun parts and stuff. I've never tried it on plastic lense though.
http://www.vermontcountrystore.com/shoppin...archid=inceptor