Our Car Three-Way Catalytic Converter Cleaner Is Carefully Formulated With Polyetheramine And Dodecane. Designed Specifically To Effectively Remove Carbon Deposits Inside The Engine, Restore Engine Power, Help Reduce Vehicle Exhaust Emissions, And Make Driving More Environmentally Friendly. The Usage Method Is Extremely Convenient: 1. Add This Product To The Fuel Tank Before Refueling, And Then Fill The Tank Up. 2. Vehicles That Have Not Been Cleaned For A Long Time May Have Black Smoke In The Exhaust During The Initial Cleaning Stage. This Is The Result Of A Large Amount Of Carbon Deposits Being Removed. After That, It Enters The Normal Cleaning Stage, And The Black Smoke Decreases And Disappears. 3. We Recommend Cleaning And Maintenance Every 5,000 Kilometers. For Vehicles That Have Not Been Cleaned For A Long Time, We Recommend Using This Product Twice In A Row. 4. Do Not Clean The Following Situations: The Three-Way Catalytic Converter Is Burned Out Due To High Temperature Or Lead Poisoning. The Three-Way Catalytic Converter Is Severely Clogged, And The Engine Is Leaking Oil. It Can Only Be Used Again After Being Treated. Moreover, It Can Improve The Fuel Combustion Efficiency, Save Fuel Consumption, Protect The Key Components Of The Engine And Extend Its Service Life.