Possible Clues:

• Washing water to a certain degree at the end
• Wash black articles together
• Club he joined to swim
• Swim and climb at health centre
• Sailor coming back with the wash
• Get into a tub
• Immerse oneself in water
• Clean in a tub
• Robin's partner, perhaps, to have a dip
• As a fly-by-night he will get 19 across by doing this