The invention relates to an apparatus and a method to clean enclosed spaces. The apparatus consists of an inlet-pipe (1) for cleaning-medium, equipped with thread (10) on outside where a vertical displacement nut (12) is located, which moves vertically when the drive-shaft (6), which is directly connected to a cleaning-medium distributor (18) and, indirectly to a shielding-pipe (8) and nozzle-arms (15, 21), is rotated by a motor (3). The upper nozzle-arms (21) and the vertical displacement nut (12) are interconnected through vertical displacement arms (14) so that the nozzle-arms move vertically and circularly in concert with the vertical displacement nut (12) when the motor rotates the drive-shaft (6). The method relates to cleaning of various enclosed spaces with different cleaning media and is effective for cleaning enclosed spaces such as storage tanks.