Carnabuna wax is not used in a manufacturing process as far as i am aware.You are not getting your information from briwax are you?
I am not saying it is used in the manufacturing, sorry if it comes across that way! i know how it is made i worked for everest years ago!
But what i am saying is that carnabuna wax protects hard surfaces against sun fading oxidation and water spots!
and that includes upvc! Some upvc cleaning companies use this method to polish up after cleaning, i have used it for quite some time and it does work,
Cleaning frames after they have been treated with carnauba wax is a lot easier the dirt just falls off!
Is upvc cleaning not what do do? then you should know it works,
looking at my original post it does look misleading! but people are just to quick to mock