Possible Clues:

• Wet part of sweater in sea water
• Colour starts to run in narrow streaks earthwards
• Shampoo-bottle verb
• Wash cycle before spin
• Get up around the nitrogen in the water
• Get up around noon and have a swill
• Douse, maybe
• Do this to remove shampoo
• Shampoo, ___, repeat
• ... and remove it