Chemical cleaning is the industrial process by which we seek to remove scale, dirt, etc., indoors or outdoors, adhered to the metal substrates of certain chemical equipment or industrial processes produced by the same faults or damage to the working fluid as these. This process generally involves applying a pre-prepared, pre-formulated chemical solution to the surface to be coated to achieve its cleaning effect. This application is generally carried out by recirculating the chemical solution, so that once in contact with the scale to be removed, it corrodes and sweeps away the scale at the same time, leaving the surface to be treated in an optimum state. Operation. The results obtained with chemical cleaning are of higher quality and notably improve the process on which they act.