1 the degreasing capability foaming character and coating quality were examined results are shown in table 1 furthermore the water soluble polycarboxylates and nonionic surfactants combined at first with the degreasing solutions in each of the examples and comparative examples were the same as those in the example 1 the 34 plurafac registered trademark lf 700 34 is a trade name of an adduct of an aliphatic alcohol with polyethylene oxide polypropylene oxide the cloud point is less than 15 u00b0 c made by basf co ltd and 34 lutensol registered trademark to8 34 is a trade name of isotridecanol octaethoxylate the cloud point is 61 u00b0 c made by basf co ltd table 1__________________________________________________________________________ comparative comparative example 1 example 2 example 3 example 4 example 1 example 2 in in in in in in passage passage passage passage passage passage initial of time initial of time initial of time initial of time initial of time initial of__________________________________________________________________________ timecontrol of degreasing solutionconcentration sodium 5 4 5 3 6 5 5 1 5 3 7 5 4 5 6 5 g l metasilicate pentahydrate soda ash 13 0 13 0 13 0 13 0 13 0 13 0 caustic soda 0 0 0 0 0 0 sodium 2 2 2 2 2 2 bicarbonate water soluble 2 2 2 2 4 2 1 8 2 1 8 2 0 2 1 7 polycarboxylate nonionic 1 1 1 1 2 1 0 9 1 0 9 1 1 5 1 0 9 surfactantph 11 2 11 0 11 2 10 6 11 2 11 2 11 2 11 2 11 2 11 0 11 2 10 2si concentration ppm 650 520 650.