Or they could have gone outside, stripped down and used a bucket to wash with cold water. Or in the nearest stream.
LOL!
Spent the entire summer up at our rustic cabin in Northern Minnesota every year growing up. Outhouse and a hand pump that produced as much water as you could pump.
Jump in the lake for a bath (Ivory soap - it floats!) Grandma would too, although I recall her sitting in a big tub down by the lake too - maybe that was when she was real old. Or mom got hot water off the stove.
Hmm - I don’t ever recall my grandfather in the lake OR the tub!? Although he died much earlier than my grandmother. They would be up there all summer too.