How do you do your laundry at sea, while cruising?
Sailors in the buff, and baring butts, don't have laundry!
Well I suppose it depends how long you are out there, your life style, conditions, craft, and what is acceptable to you and those on board.
Dragging a bag or basket in the sea water full of laundry, certainly would remove body odors, dander, hair, etc. The trade off is the laundry aquires sea residue and salt, likley not desireable either. Take the salted laundry and rinse it in fresh water to remove the sea accumulation?
Unless I change my thoughts from a 50 footer mono to something longer, or a cat, I can't see a place or space for a clothes washer, much less a dryer. The water and fuel to operate those must put it into "would even not consider it" class. Yet one must maintain some degeree of personal hygiene.
Do you take it ashore to a laundra-mat?
Have the navtives do it?
Use a washboard on the boat?
Pre-rinse in sea-water, final wash in fresh water?
Sail in the buff?
Smell Really Really Bad?
Dry your thingies in the wind?