Cleaning and passivating solution for rare earth continuous magnets

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A cleaning and passivating solution, the rare earth-permanent magnet has, for example is suitable for, comprises at least the following components : -phosphoric acid, -at least one water-soluble salt of nitric acid, -at least an anionic surfactant, -at least a non-ionic surfactant, -at least one alpha-hydroxycarboxylic acid and -at least one water-soluble primary amino-and/or ammonium compound, wherein the cleaning and passivating solution a pH value in the range from 1.5 to 4.