AC Pro Car Air Conditioner Cleaner helps remove bacteria buildup that causes bad odours and weak airflow. It cleans, disinfects, and refreshes the entire A/C system in just 10 minutes. The product uses a simple “lock and leave” application method. To use it, shake well, run the A/C on full internal circulation, place the can behind the front passenger seat, and activate it. After the can empties, turn off the engine and ventilate the vehicle thoroughly.