Check this guy on youtube that uses a five gallon bucket, a toilet plunger, and put the lid on with a hole thru the top center...and he has the kids plung it up and down like a butter churn, no splashing!
for boyscouts or campers who are roughing it, this is a great idea, or for when you "ONE" machine owners breaks down, it a simple, quick, and easy way to get your laundry done, you do what you got to do when in a tight spot, improvise!