If you live in a city, you know that the air is polluted. Part of the pollution comes from cars and trucks, but another big part comes from the smoke and soot that come from factories and other businesses. One way to reduce the amount of pollution in the air is to clean your windshield. This is especially important if you have a car with an automatic transmission. When the car shifts gears, it pumps dirty air into the engine and out through the exhaust pipe. To clean your windshield, first use a cloth to remove any dirt or dust. Then use a glass cleaner that is specifically designed for windshields. Be sure to rinse off the cleaner completely before using it on your glass again. ..