Using these tail light turn signal overlays is easy. First, make sure your car's tail lights are clean and dry. Then, carefully place the overlays on the clear part of the factory tail lights. Press firmly to ensure they stick well. When it comes to maintenance, just clean them with a soft cloth and mild car cleaner regularly. Avoid using harsh chemicals as they might damage the overlays. Also, be careful when installing or removing the overlays to prevent any scratches or tears.