There are several alternatives to using an electric powered washing machine... all of them have their specific design benefits, but one thing they all have in common is you no longer depend on the grid (aka electric energy) in order to get your laundry squeeky clean...
I happen to have the Lehman's Hand Washer (which is almost the same exact design as the well known James Washer!) Whenever anyone comes over to visit at the Luck Cabin they love to see how the Hand Washer really works - children are especially into it (i know, shocking!), they'll beg me for more laundry to wash. I bet you parents out there don't hear that often (ever?)!
Here is a quick vid to show how the hand washer works in the real. I included some deleted scenes at the end. ;)
PS --- I could not get this video to ever edit captions and sounds in sync, so I had to leave out the captions... the last four scenes after "the end" are the deleted scenes. :))) Eventually I will figure out this technology shit.