Water and oil repellent needle felt dust bag how to clean? 1. Cleaning: The high-frequency vibration, the larger dust particles will enter the water-repellent and oil needle felt dust bag inside try to clear the wall. 2, the chemical experimental treatment: water repellent and oil extraction needle felt dust bag sample, using professional equipment to detect oil bag masonry ingredients, so washing raw material selection to adapt to the force with moderate intensity maximum wash cloth.