Mine look fine after 56,000 miles but they are sharp. When cleaning the car I worry about them cutting my hand. And that is why I am not spending several hundred because it is just annoying but not that big of a deal.
I use the same stuff I use to clean monitors
screen mom cleaner and extra large lens cleaning microfiber
Amazon.com: MagicFiber Extra Large Microfiber Cleaning Cloth for TV Screens & Monitors | Great for OLED, Computers, Laptops, Cars & Electronics, Eyeglass & Glasses Cleaner : Health &...