Using these rain guards is easy. First, make sure the window area where you'll install them is clean and dry. Then, peel off the backing of the pre - mounted adhesive on the rain guards and carefully stick them onto the window. Press firmly to ensure a good bond. When using, you can leave your windows slightly open during light rain or mist to let fresh air in while keeping the rain out. As for maintenance, you can wash the rain guards with mild soap and water. Just use a soft cloth to wipe them clean. Avoid using harsh chemicals as they might damage the rain guards. And when not in use for a long time, try to keep them in a dry and cool place to maintain their quality.