The answer to 'how to maintain window' is to clean your windows regularly to keep them looking their best. This involves wiping down the glass, frames, and sills using a microfiber cloth and a mild, streak-free window cleaner. You should also inspect the windows for any cracks, chips, or other damage and address them promptly to prevent further issues.
It's generally recommended to clean windows every 1-2 months, or more frequently if they get particularly dirty. This will help ensure your windows stay clear and streak-free, allowing maximum natural light to enter your home.