Abstract: The means for simultaneous scouring of metal surfaces contains a waste product in manufacture of fodder yeast, citric acid, ammonium citrate, aqueous solution of sodium gluconate, sulphonated ricinic oil and an inorganic acid, f.e. sulphuric acid respectively in the following weight ratios: 60 to 95%; 2 to 6%; 0.1 to 10%; 0.0 to 4.0%; 0.0 to 20% and 0.0 to 15%. The waste product from fodder yeast manufacture contains itself 0.06 to 0.1% reducing agents; 0.01 to 0.4% phosphates; 0.2 to 0.4% ammonium sulphate; 0.0 to 0.06% furfurol and 0.0 to 0.1% yeast.The means for simultaneous scouring of metal surface from corrosion products, scale and scoria is used in metallurgy, machine construction, agriculture, energetics and all fields where there are conditions for metal corrosion.