To install these OLM LE Dry Carbon Rear Door Trim Upper Panels, first make sure your hands are clean. Gently place the panels inside the rear doors of your 2015 - 2021 Subaru WRX or STI, aligning them carefully for a proper fit. When cleaning, use a soft microfiber cloth to avoid scratching the clear coat. Don't use harsh chemicals as they can damage the carbon fiber. Regularly check the panels to ensure they remain firmly in place. If you notice any issues, it's best to consult a professional.