FWIW: One kind of soap for washing clothes, body, hair and dishes is all I take. I have used baby shampoo, camp suds, dr bronners, liquid body wash, and even bar soap. All will work OK for all of those purposes even in a washing machine. I have decided that I actually prefer the baby shampoo. I use it sparingly and find that I can get by with a two ounce bottle for a month or so. Especially if I use other soaps when available. If I get a room or shower somewhere that I can refill the bottle I do so. That way I can go pretty much indefinitely without having to buy a too big bottle. If I do run out I look for sample sized shampoo and if I can't find that I buy the smallest bottle of camp suds I can find.