Using your Poseidon matte black rectangular mirror is easy. First, decide whether you want to mount it vertically or horizontally. Then, use the sliding wall brackets for a simple and quick installation. Just make sure to choose a suitable spot on your wall. When it comes to cleaning, use a soft, dry cloth to gently wipe the mirror surface. Avoid using harsh chemicals as they might damage the matte black finish. If there are stubborn stains, you can use a mild glass cleaner. Keep the mirror away from sharp objects to prevent scratches. With proper care, your mirror will stay beautiful for a long time.