Using these AC vent control knob overlays is easy. First, pick the color you like. When you're ready to install, make sure the area where you'll put the overlay is warm, around 70 - 80 degrees. Clean it well to get rid of any dirt or other stuff. You can use an alcohol prep pad to do a great job. Try fitting the overlay on the knob first to see how it looks. Then, take off the backing of the double - sided adhesive and stick it on. Press it evenly so it sticks well. As for maintenance, just use a soft cloth to wipe it clean. Avoid using harsh chemicals that might damage the carbon fiber finish. And remember, these overlays are made for 2022 - 2025 Subaru WRX models, so don't try to use them on other cars.