HPS Performance Air Filter Cleaning Kit HPS-AFRCKey Features Two part cleaning and re oiling kit to give your HPS cotton air filter a complete refresh. Regain optimal airflow and engine performance. Cleaning solution helps lift and wash away dirt build up and dirt particles. Specially formulated sensor safe recharge oil features red dye to ensure even application onto the filtering surface. 4 oz. of cleaner and 2 oz. of oil comes in convenient spray bottles for easy application. The HPS Performance