The water or hot water used for washing may also contain an organic solvent, plasticizer and surfactant such as acetic acid, methanol, glycerin, and the like, in an amount which does not lose the object of the present invention. [0026] The temperature of the water or hot water used for washing is preferably from 10 to 90??? C., more preferably from 20 to 80??? C., further preferably from 25 to 70?