Our car windshield oil film effervescent tablets contain sodium bicarbonate and citric acid. It can enhance the driving experience and ensure driving safety. Its use method is very simple: take the effervescent tablet and dissolve it in the right amount of water. Apply the foam cleaner evenly to the surface of the windshield. Gently wipe the windshield with a tool to help remove oil film and dirt. Rinse with water. And use environmental protection formula, pay attention to environmental safety, rest assured to use.