Using these mirror covers is super easy. First, make sure your car is a 2015 or later WRX or STI with turn signals in the mirrors, and it's a 2015 - 2019 model. Before you start the installation, clean the stock mirror cover really well. The covers come with pre - installed double - sided adhesive, so you just need to stick them on, and it'll take only seconds. As for maintenance, you can clean them with a mild car cleaner. Avoid using abrasive materials that could scratch the carbon fiber. Keep them away from sharp objects to prevent damage. That's all you need to know to enjoy these cool mirror covers on your Subaru.