If you can still get it at your local screwfix, the No Nonsense cleaner has been my go to. A light scrub with a paintbrush to get into any seams and corners then wipe off with a microfiber.
If there's only the new Essentials stuff, a bowl of hot soapy water will be just as good!
@stevo_com (or anyone else for that matter) what did you use to clean the cigarette stains from your upvc windows?