The Genuine BMW Hose Line Headlight Cleaning System (part number 61677179469) is a component used in BMW vehicles for cleaning the headlights. It is a hose line that connects to the headlight cleaning system and sprays water or cleaning solution onto the headlights to remove dirt and debris. This product is a genuine BMW part, designed specifically for BMW vehicles, ensuring quality and compatibility. It is a necessary component for maintaining the cleanliness and functionality of the headlights.