Piccolo Nero e Bella
Prominent member
Modern windscreens, in my understanding, block most UV rays, so the marketing of clear UV for windscreens is a sell job, just like paint protection that dealers plug hard (knowing that I still bought the paint protection anyway! )
That seems to be borne out by this document from VicRoads on window tinting. Interestingly enough it doesn't appear to ban film altogether (as I would have expected) as long as it permits a certain level of transmitted light.
www.wfaanz.org.au/LiteratureRetrieve.aspx?ID=24213
I believe laminated windscreens have UV blockers to protect the vinyl layer sandwiched in the glass.