Join Date: Apr 2002
Location: Dandridge (Near Knoxville), TN, USA
Re: Polishing windshield
You will have NO luck trying to polish a stock LT windshield! It is made of Polycarbonate (Lexan) for safety purposes, as it will not shatter like Acrylic (Plexiglass). Most other motorcycles use Acrylic, but BMW is more safety minded.
Problem is that Polycarbonate is much softer than Acrylic, so the windshield has a scratch resistant coating on it. That coating cannot be "polished" like plain Acrylic. If you try abrasive products on it you will just end up removing the coating in spots, and the underlying Polycarbonate is far more difficult to polish out than Acrylic is.
As suggested, try Turtle Wax ICE. That will not "Polish" it, but may fill in the micro scratches and make it look much clearer.
One thing to know though, is that the stock coating has a tendency to absorb moisture and become "cloudy" or "hazy". That may be a big part of your current problem. That moisture can be removed by soaking a rag in denatured alcohol and rubbing the surface until the haze clears. Only THEN should you try any coating, like ICE or Plexus, as that will seal any absorbed moisture into the coating.
To see if it is moisture, let the bike sit with the sun on the windshield for some time, that will also drive the moisture out if it is a nice dry day.
I don't want to achieve immortality through my work...I want to achieve it through not dying.
EX: '01 Black LT, BAT BYKE (Totaled at 110,000 miles)
IBA SS, BB, BBG, 10/10ths.
No bike now, but maybe in the future.