Air conditioner and cleaning method

The invention provides an air conditioner and a cleaning method. The air conditioner comprises a shell, an air duct and an air outlet are formed in the shell, a heat exchanger and a filter screen are arranged in the shell, the filter screen can move in the shell, the filter screen has a first state and a second state, when the filter screen is in the first state, at least part of the filter screen moves into the air duct, and when the filter screen is in the second state, the filter screen moves into the air duct along the airflow direction in the shell. The filter screen and the heat exchanger are sequentially arranged, the air duct is located between the heat exchanger and the air outlet, an air guide plate is arranged on the shell and arranged at the air outlet, the air guide plate is provided with a first position for opening the air outlet and a second position for sealing the air outlet, and when the air guide plate is located at the second position, liquid generated on the heat exchanger can be collect