You can rinse your hair faster when you use both hands to get the soap out of your hair.
Soap comes out of your hair much faster when you rinse it with both hands at the same time.
1) You can rinse your hair faster when you use both hands to get the soap out of your hair.
「髪の毛の泡を落とすのに両手を使うと、もっと早くゆすぐことができる。」
2)Soap comes out of your hair much faster when you rinse it with both hands at the same time.
「両手を同時に使ってゆすぐと、髪の毛の泡がもっと早く落ちる。」
「髪をゆすぐ」は rinse one's hair のようにいえます。
「両手を使うと」は when you use both hands や with both hands を使って表現できます。
「髪の泡を落とす」は get the soap out of your hair といえます。
ご参考になれば幸いです！
日本 
