FIELD: industrial detergents used for chemical treatment, cleaning and degreasing metallic surface from organic contaminants, and anticorrosion protection thereof. SUBSTANCE: detergent comprises, wt %: mixtures of nonionic and ionic surfactants, ratio of nonionic surfactant to ionic surfactant being (2-8): 1,4-20; polyelectrolyte, 2-12; benzoic acid salts, 0.01-0.02; and active constituent, the balance. Also described is method of preparing said detergent by mixing prepared components in periodic action mixers. EFFECT: higher detergent power and anticorrosion protection of surfaces being treated. 13 cl, 12 ex, 2 tbl
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