Thanks for the explanation, but I will not be bothering with the Autoglym windscreen cleaner as well as the other Polar Range products I already use. I am just not that obsessive about cleaning my car. Nope, not for me. I have enough cleaning products already and that would just be a step too far for me. Not going to place that order. No no no.I do it to clean off any overspray of the Polar Seal as recommended by AutoGlym. I stick with that recommendation as I've seen several screens suffer from an immoveable film buildup after something (I'm assuming silicone based treatments) being applied, so don't want that screen going the same way. I'm happy to stick to the recommendation especially since AG Fastglass does work so well it something I keep in the boot anyway.
I'm not always sure that AG don't upsell their other products to cover other scenarios, but tbh its not confined to AG, or even car cleaning products. I think there are many products out there that require several individual solutions where as years a go, one product will have done for all uses. Look at many car cleaning manufacturers product ranges and you will find a very specific product for a very specific task. So I don't really blame them for upselling a glass cleaning product for cleaning the windscreen even if another of their products will do a very reasonable job.
I wish that I had found the AG Polar range sooner - they are a revelation to me, although happy to accept that there may be better individual items that could always be used. I've got a box full of car cleaning products that I don't think I will ever touch again. The only down side is their environmental credentials, but I have thought of the impact of these products and, rightly or wrongly, I am comfortable that on balance my usage of them will have minimal additional impact over other car washing methods.
Message from Amazon: 'Your order of Autoglym AG Fastglass is due to arrive on Sunday'
Damn! Moment of weakness...