Prospin is an additive able to give a high sequestering power to alkaline cleaning solutions. Prospin allows obtaining a high sequestering capacity with regard to mineral salts present in the solution and those deposited on surfaces. Such behaviour is also addressed to all those deposited inorganic components, extremely difficult to be removed, such as oxalates (vegetable and beer stone) and calcium phosphate (milk stone). Prospin can be added proportionally by means of automatic dosing systems into the alkaline washing solution.