Acid CIP is a formulation based on nitric and phosphoric acid, enabling to obtain a solution with a high descaling power, able to remove organic residues from surfaces. It also acts as a passivating agent of stainless steel surfaces. Acid CIP can be used for a wide range of applications in food industries, beverage bottling industries and in the dairy field, as it is also able to remove milk and beer stone. Suitable also for the zoo-technical field.