Pure Carnuba wax,. Works great on car headlamps/bike headlamps/bike windshields etc. Yes water will bead and run off. I won a bottle of Novus #1 in a raffle once and I do not see it works any better than carnuba. I would only recommend what is labeled as pure carnuba, definitely not a cleaner wax because they have abrasives, to clean with.
I use Mothers #3 with a orbital buffer on my car & bike headlamp lens and they look like new and even bugs wash of without effort. I also use orbital buffer with soft micro-fiber cover over a foam wax pad with Stoner Glass cleaner on my car windshields. Windshield will pass for new visually and water passes off above 30 MPH. Has nothing to do with bike windshield just a tip