Liqui Moly AC System Cleaner Solution (Active-2P) - 20001; This product is a professional grade aerosol cleaner designed to quickly and effectively clean air conditioning systems in cars, buses and trucks. It removes oil, grease, dirt and other deposits from the AC system and its components, and helps to restore the system's performance. It is safe for use on all types of metals and plastic components, and can be used with all types of AC compressors.