METALLREINIGER MIT POLYETHYLENIMIN

Aqueous cleaning agent concentrate (I) comprises water, propylene glycol ether and/or non-ionic surfactant, polyethylenimine and cationic surfactant. Aqueous cleaning agent concentrate (I), comprises water, glycol ether of formula (A) and/or non-ionic surfactant, polyethylenimine and cationic surfactant. R-O(CH 2-CH(CH 3)-O) n-H (A) R : 1-4C alkyl or phenyl; and n : 1-5. Independent claims are also included for: (1) an aqueous cleaning solution, obtained by diluting 0.5-5 parts by weight of (I) with 99.5-95 parts by weight of water; and (2) a method for cleaning oil- and/or fat- polluted metallic surfaces, comprising contacting the surfaces with (I).