noun
no-poo; washing hair with water only
A method of washing hair using only hot water, without shampoo or other products. Often associated with natural hair care routines.
最近、湯シャンを始めてから髪の調子が良くなった。
Since I started washing my hair with just hot water, my hair has been in better condition.
湯シャンはシャンプーを使わないので環境にも優しいと言われている。
No-poo is said to be environmentally friendly because it doesn't use shampoo.