Best I can tell the problems I had with the Honda windshield wasn't that it got scratched brush busting, I did plenty off that and didn't get anything but a few minor scratches that I could have lived with. It was that I ruined it by cleaning it improperly. According to the manufacturer's instructions, that I never saw or read until I looked them up online after the fact. What they say is this:
No chemical cleaners, water or water and a mild soap only and no rubbing until rinsed off with water only, especially no alcohol or ammonia containing products, no windex type cleaners as they can cause the windshield to cloud up. No paper products for washing or wiping as they will scratch the windshield, best is to use your hand and clean water or a good quality chamois cloth.
I had used paper towels and windex to clean mine at times, I didn't get the clouding they warned about, but I did get hundreds of tiny scratches that you couldn't see unless you were driving into the sun. I finished it off while returning from a hunting trip in Colorado and washing the windshield off with a squeegee at a truck stop. The windshield was covered with road grim and mud. While cleaning the truck windows, the 500 got scrubbed off, too. I might as well have used sandpaper. After that there was no seeing through the windshield while driving into the sun. Instead of paying another $400 for a new one, I tried this. Hopefully others can learn from my mistakes and keep their plastic windshields in good shape, but if you have one that is scratched up, instead of throwing it out you might want to try this, too.