FIELD: manufacture of laminated plates for removing melamine- carbamide resin deposit from press gaskets. SUBSTANCE: solution comprises water and cleaning components such as Cr6+ ions, potassium bifluoride and nitric acid, ratio of components being as follows, %: compounds Cr6+ (in terms of CrO3, 2-3; potassium bifluoride, KHF2 4-6; nitric acid; 3.5-5; and water, the balance. EFFECT: shorter cleaning time and excellent quality of cleaning. 2 cl, 4 ex, 1 tbl
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