Cataclean is a fuel and exhaust system cleaner. Cataclean will remove the harmful carbon build-up in the valves, injectors, oxygen sensors, EGR valve and catalytic convertor. Cataclean can improve fuel economy, reduce emissions, restore performance and extend the life of engine/exhaust parts. Reduces vehicle emissions by up to 60%. Improves fuel economy & restores performance. Protects & maintains catalytic converter. To use: Remove seal before emptying entire contents of one bottle of Cataclean® Petrol into fuel tank. Then drive for at least 15 minutes and refuel when necessary. Recommended ratio of one 500ml bottle of Cataclean® Petrol to approximately 15 litres of fuel.