forgot to say

water temperature to wash corpse, cold water, because of many reasons, one of these is the time period and the economic background of the killer, this is wartime over period, and these folks don't have a lot of hot or warm water to waste at this time, and also the killer did this where he was most likely alone in a private home, is my first guess, and the second would be in some type of business alone, again, if it was a garage, cold water, but i don't think it was a garage or even the back of a restaurant, because we need a bathtub. and we need a time period to be alone and do this entire event. so that is not a place where anyone else is around. private house. and therefore the water has to come from a heating tank, 1947 period or earlier, most likely it was not a new tank, results, cold water.