x2
Works on helmet eye-visors and convertible rear windows too!
Meguiars is high-quality stuff trusted for use on zillion-dollar collectible cars.
A bit of a PITA to polish a bunch of discs with a buffing wheel though, a machine would make it far easier. If you do use a manual buffing wheel, use a true bench buffer. If you need to use a hand drill to power the wheel, be sure to clamp the drill to a table instead of trying to hold it in-hand.