2 years ago I purchased my 2017 F3T and shortly after that I upgraded to a F4 windshield. I was just cleaning my windshield and I noticed a scratch. It's not that bad, but I can feel it with my fingernail. I know F4 doesn't cover scratches in their warranty. Is there a way to remove scratches without screwing up my windshield? It runs down the middle of the windshied.