When cleaning an acrylic windshield like the one that go on fishing boats, Novus No 2 is the best you can use. We use it here at the shop to clean the windshields we ship out. Windex and alot of other cleaning materials will ruin your windshield. Windex causes something like a disease in the material called Crazing. The windshield developes little cracks underneath the surface and the process can’t be reversed. At worst, just use water to clean your acrylic windshield and at best use Novus No 2.