Walnut shell granulate for extremely effective and gentle cleaning of intake manifold plugs in engines. Simultaneous blasting and suction of the walnut shell granulate gently cleans the valves of all residues and improves the performance and expected lifespan of components and engines. Cleaning of all elements affecting coking, such as throttle bodies, intake manifolds, exhaust gas recirculation valves, etc., is equally effective. Includes 2 kg of walnut shell granulate.