PROBLEM TO BE SOLVED: To provide a cleaning method of hair and a solid bath agent for cleaning hair which are called as a carbonic acid gas bath agent or a bath agent, used for bath, shower, shampooing, aesthetic or the like, and have excellent cleaning power of mineral stain.SOLUTION: In a solid bath agent containing bicarbonate (sodium hydrogen carbonate or potassium hydrogen carbonate) and organic acid, PH of aqueous solution immediately after dissolving the solid bath agent is 5.5 to 9.0, and the agent does not contain bicarbonate ion blocking substance, in which the organic acid is at least one of citric acid, fumaric acid, succinic acid, malic acid, and the agent contains anhydrous sodium carbonate and/or anhydrous potassium carbonate, hot water in which the solid bath agent is dissolved is brought in contact with hair for cleaning, bicarbonate ion in hot water is prevented from being blocked by the bicarbonate ion blocking substance, smoothness when hair is combed by fingers, feeling of thickness/volume and high elasticity of hair after drying are obtained.SELECTED DRAWING: NoneCOPYRIGHT: (C)2018,JPO&INPIT【課題】本発明は、炭酸ガス浴剤ないし入浴剤と称され、入浴、シャワー、洗髪、エステティック等に用いられ、ミネラル汚れの洗浄力にも優れている毛髪の洗浄方法及び毛髪の洗浄用固形浴剤を提供する。【解決手段】重炭酸塩(炭酸水素ナトリウム又は炭酸水素カリウム)と有機酸を含有する固形浴剤において、固形浴剤を溶解した直後の水溶液のPHが5.5から9.0であり、重炭酸イオン封鎖物質を含有しない固形浴剤であって、前記有機酸がクエン酸、フマル酸、コハク酸、リンゴ酸の少なくとも1つであり、かつ無水炭酸ナトリウム及び/又は無水炭酸カリウムを含有する固形浴剤であり、該固形浴剤を溶解させた湯水を毛髪に接触させて洗浄し、湯水中の重炭酸イオンが前記重炭酸イオン封鎖物質により封鎖されるのを抑制し、手ですいたときの抜けの良さ、乾燥後の髪の厚み・ボリューム感及びコシの強さを得る構成である。【選択図】なし
