Spark plug cleaners utilize an abrasive blasting method to remove carbon buildup.
The wing-type Air Valve Control governs the flow of both air and abrasive particles within the cleaner.
Compressed air transports the abrasive particles, directing them at the spark plug electrodes.
Regulating both air and abrasive particle flow ensures effective cleaning without causing damage to the spark plug.
Partial control over either air or abrasive particles reduces cleaning efficiency.
Pressure provides the motive force for the flow; the flow itself consists of air and abrasive particles.
Therefore, the correct answer is air and abrasive particles.