Using these Noble 1.0 rain guards is easy. First, make sure the window area where you'll install them is clean and dry. Since they come with pre - mounted adhesive, simply peel off the backing and stick them onto the window. This process should only take a few minutes. When using, you can leave your windows slightly open even when it's raining or windy, and enjoy fresh air inside your car. As for maintenance, just use a mild soap and water solution to clean them. Avoid using abrasive cleaners as they may damage the rain guards. Also, be careful when opening and closing the windows to prevent the rain guards from getting knocked off or damaged.