I can change my view... After you left Andy I did consider your views, discarding most, but thought the GTech stuff (C2v3 Liquid Crystal) might be worth evaluation; so I searched around the old drawers, back of the sofa, under the bed, and in the garage even and found sufficient funds to purchase a sample bottle, ok 500ml.
Mixed at 1:1 initially and then 1:2 with (de-ionised water - sorry!) it is truly impressive: bodywork, glass, wheels, etc. Am seriously impressed!
So good I tried it on the house windows (mixed at 1:4) and PVC frames and again, quite amazing! Better than Rapid Detailer...
So yes, a grovelling thank you for that...
Going to try GTech's P1 Polish and Micro fibre cloths next - but you didn't suggest those, did you?