Parts & Accessories Spare parts Wynn's Catalytic Converter Cleaner 500ml Are you looking for an effective solution to clean your catalytic converter and restore the efficiency of your car's exhaust system? Wynn's DPF & GPF On-Car Cleaner, 500ml, is the perfect choice! This specialized product effectively cleans the Diesel Particulate Filter (DPF) and Gasoline Particulate Filter (GPF), helping to improve engine performance and reduce harmful exhaust emissions.