A proficient filter cleaning method must effectively purge both the inlet and outlet channels of the filter. It should eliminate contaminants such as soot, ash, carbon deposits, and cerium oxide particles, while also safeguarding the integrity of the filter core insert. How can I tell if my DPF requires cleaning? If you observe any of the following signs, it may be time to clean your DPF: The DPF warning light is on your vehicle's dashboard. Decreased engine power. Trouble starting the engine. The automatic stop-start system is not working. Reduced fuel efficiency. Cooling fans operating more often than normal. Black smoke coming from the exhaust when accelerating. A noticeable diesel odor inside the vehicle.