The air conditioning system is a fairly favorable environment where bacteria can grow and get into the air during operation, which is definitely not healthy for the driver and passengers. The antibacterial treatment of the air conditioning system can be carried out manually. For this, it must be completely disassembled, cleaned and treated with special substances. Chemical antibacterial cleaning of the car air conditioning system is carried out with the engine turned on and with the air conditioning system operating at full power in the recirculation mode. In this case, it is required to place a container with the agent near the air intake pipe and spray it. During ultrasonic cleaning, it is required to place equipment in the passenger compartment, and this equipment, by means of ultrasonic waves, disperses the cleaning compound, creating a dense "fog", while the air conditioning system operates at maximum rotation in the recirculation mode.