Polishing your windshield is a great way to both improve visibility and make your windshield look new. However, it's not the best choice in all situations. Extensive windshield damage often can't be removed by polishing it, which will leave you with continuing visibility problems. Excessive glare or poor visibility due to dust and dirt buildup is a safety issue, so it's important for your windshield to be in good condition. To help you stay safe while driving, read on to find out when you should replace your windshield instead of attempting to polish it.