As a complement to the process of automatic cleaning of storage tanks we perform numerous additional works, exerting a positive impact on the efficiency of the entire installation, e.g. washing the bottom of the tank, washing the bottom of the floating or fixed roof, roof sealing sheets and roof sidewalls, washing the main surface of the roof including the foam board and the space between the board and the seal, washing the inner surface of the tank shell, washing the roof supports from the outside and inside, washing the roof drainage system, and washing all the equipment located under the tank roof.