The cleaning method of automotive air conditioning system is: you can buy air conditioning cleaning agent, shake the air conditioning cleaning agent and cover the hose in the package, turn the air volume of the air conditioner to the maximum and adjust it to the external circulation mode, spray the shaken cleaning agent at the position of the air conditioning filter element, and the hose on the cleaning agent should not be too close to the blower to avoid being stirred in. After spraying the cleaning agent, you can let the air conditioning system run in the external circulation mode for a few minutes. If the air filter is not very dirty, you can use a blower to blow the air conditioning filter element from inside to outside. If there is still odor after cleaning the air conditioning system, it means that there is dirt inside the evaporation tank or the air conditioning pipeline. In this case, the air conditioning pipeline and evaporation tank can only be disassembled and cleaned, and then go to the 4S shop or professional maintenance shop.