Manual says windshield is poly, vs. glass, and tells you how to clean it.
Manual consulted: OMUC13636
From the manual:
Avoid damage! Some cleaning compounds may attack the polycarbonate material, resulting in cracks that weaken the material.
Never use compounds that contain substances such as ammonia, gasoline, lacquer thinner, and turpentine.
Use of abrasive cleaners on windshield may cause damage.
Never use substances such as acetic acid, acetone, benzene, benzyl alcohol, brake fluid, butyric acid, carbon tetrachloride, ethyl ether, methyl alcohol, phenol, sodium sulfide, sodium hydroxide, sodium nitrate, trichloroethylene, toluene, xylene, or petroleum products.
The windshield and windscreen are a polycarbonate
material which is softer, but stronger than, glass.
The following cleaning agents are compatible with polycarbonate when used according to the manufacturerís recommendations: Formula 409ģ (without ammonia), Joyģ, Ultra Palmoliveģ Original, Top Jobģ, Mr. Cleanģ, and Fantastikģ.
Rinse as much loose dirt off as possible with warm water and a soft cloth or sponge before washing.
Wash with mild soap or detergent and rinse thoroughly with clean water.
Cleaning in direct sunlight causes streaking on surface.
Thoroughly dry windshield with a chamois or moist sponge to prevent water spots.
Polishing or Waxing Windshield
Minimize scratches and minor abrasions with a mild automobile polish.
Test effectiveness of polish or wax in a small corner of windshield before using on entire windshield.