Using these OLM LE Dry Carbon Fiber Rear Door Trim Upper Panels is easy. Just find a professional or follow the installation guide carefully to fit them onto the rear doors of your 2015+ Subaru WRX or STI. When installing, make sure the surface is clean and dry for a better fit. As for maintenance, avoid using harsh chemicals or abrasive materials to clean them. A soft cloth and a mild cleaner will do the job well. This will help keep the ultra - glossy finish looking great for a long time. Store them in a dry place if you're not using them. And always handle them gently to prevent any scratches or damages.