To provide a fluid mixture jet apparatus which jets a fluid mixture of air containing fine washing water particles, to be capable of removing dust containing carbon and the like adhering to a coated surface, a fluid mixture jet apparatus (10) includes a two fluid mixing tank (11) in which flowed air (1) and washing water (3A) containing detergent are uniformed in pressure, an air passageway (12) connecting from the two fluid mixing tank (11), a washing water channel (13A), an ejector part (15) to which the air passageway (12) and the washing water channel (13A) are connected, to form the washing water (3A) into fine washing water particles, and an jet nozzle (16) that jets a fluid mixture (5) of the compressed air (1) and the pure water 3 made into fine water particles at high speed, and the fluid mixture (5) containing the pure water 3 made into fine water particles at high speed, to break the pure water (3) made into fine water particles, so as to remove a small amount of residual contaminants from a coated surface.