Like our ordinary family car, the air filter used at present is basically made of paper, so you can not use water or oil to clean directly, otherwise it will cause damage to the air filter, make its permeability decline, or even direct failure. The correct way is to use an air gun to blow. When blowing, pay attention to the pressure of the air gun, which should be controlled at about 0.2 to 0.29 Mpa. The direction of blowing is to blow from the inside to the outside.