Regular baths according to this link:
http://www.bowfin.org/website/bowfin...ater/water.htm
Quote:
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Fresh water is vital on board a submarine not only for drinking, cooking, and washing, but also for storage batteries, boilers, and as a cooling agent for the diesel engines. An American World War II submarine on a war patrol required a minimum of 600 gallons of fresh water a day. Beyond this, remaining water supplies should leave enough for each man in the crew to have a bath at least twice a week. Cooks were normally required to bathe every day, for obvious reasons.
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Well thank goodness, I guess.
