Installing these tail light overlays is easy. First, make a mixture of water and a drop of dishwasher soap. Use this mixture to clean and wet both the overlay and the tail light. This will help you align the overlay properly. Place the overlay in the right spot on the tail light and use your fingers to squeegee out the water. This way, you won't damage the overlay's surface. Let the overlay sit for 24 hours so it can fully stick to the tail light. Once it's completely dry, it can withstand automatic car washes and most power washing. Keep in mind that proper installation is key for long - lasting results. If you want to maintain the great look of the overlays, avoid using harsh chemicals when cleaning your car.