As seen on Two Guys Garage on the SPEED channel: You've heard the Mass Air Flow Sensor is a sensitive part of your engine. To clean your Mass Air Flow Sensor use a product specific to the Sensor, use CRC Mass Air Flow Sensor Cleaner. The spray on CRC Mass Air Flow Sensor is strong enough to clean carbon and other deposits, but is safe on the plastic housing. CRC MAF Sensor Cleaner reduces rough idle and improves fuel mileage!