Care (windows)

Regular or aerospace 303 I have used for the clear plex windows... but... 303 does have a version for windows only:

http://www.goldeagle.com/product/303-marine-clear-vinyl-protective-cleaner

For restoring plastic windows from scratches McQuiars: http://www.meguiars.com/en/marine/products/#swSqOxDPsb2PidXD.97

as well as Plexus: http://www.plexusplasticcleaner.com/about.html