After shampooing, make sure to rinse your hair thoroughly with clean water.

rinse 是动词，意思是"冲洗、漂洗"，指用清水或其他液体将头发或物体表面的泡沫、污渍等冲洗干净。在洗头发的语境中，rinse 特指用清水冲掉洗发水泡沫的动作。