This product is a professional headlight cleaner that was actually used on customers' cars at the car shop where I worked. It can be used not only for yellowing and whitening of headlights, but also for removing water stains, tar, and other dirt from the body. Since it does not contain abrasives, damage to the paint can be minimized, so you can use it with confidence. The 30ml capacity is enough for about two headlights. To remove water stains from the body, wash away dust with water, apply the cleaner evenly to a wet cloth, and immediately rinse it off. To remove yellowing from headlights, apply directly without water, spread it, wipe it off with a cloth when it's semi-dry, and then rinse with water. When applying at a shop, we use this product to remove dirt from deteriorated headlights, sand them with waterproof sandpaper, and then apply clear coat. It's difficult for the average person to do that much, but anyone can easily apply this product just to remove dirt. The photos in the images are just polished with this product, so please refer to them. Also, the cause of yellowing and whitening of headlights is the deterioration of the hard coat and the polycarbonate material used in the headlights. Even if you clean it with this product, if the hard coat is still deteriorated, the yellowing will reappear quickly, so we recommend protecting it with a coating agent. Please be aware that there are products that claim to be as good as new, but they strip off the hard coat and look clean at first glance, but the headlights will deteriorate further and become more yellowed and whitened than before. To avoid misleading buyers and repeat customers, I would like to state that although many headlight cleaners are listed, some sellers are listing images of our work, but the contents are completely different, so please be careful. You may receive feedback that the container is different, but we will ship in either of the containers shown in the photos, so please purchase with your understanding.