Using these Lamin - X fog light covers is easy. First, clean your fog lights thoroughly to make sure there's no dirt or dust. Then, carefully peel off the backing of the cover and align it with the fog light. Press it down firmly to ensure it sticks well. As for maintenance, you can wash them just like you wash your car. Use a mild soap and water, and gently wipe them clean. Avoid using harsh chemicals or abrasive materials as they can damage the covers. Also, check the edges from time to time to make sure they're still firmly attached. If you notice any lifting, press it down again to keep a good seal.