Exactly as Robert3985 , and the others, have said...
The Future Floor wax is used as a clear gloss coat, not for the actual make-up of the window material...it's such a glossy coat that it fills and 'removes' tiny scratches and imperfections, making the clear part more 'clear'...it also has the quality of removing 'distortion' from thick, curved pieces of clear styrene, again, making them appear more 'to scale' thickness and more 'clear'
Respectfully,
~Bruce