RayW:

If you know anyone that plays exotic instruments, you could always borrow their washboard.

One other highly overlooked device is a clean toilet plunger. Put your clothes in a large tub with water and detergent and plunge away. You end up with a double stroke if you go all the way to the bottom and force compression of the plunger so that on the way up, it pulls water and clothes up as the bellows snaps back.

If you wash by hand, a good way to use less rinse water is to hang your detergent laden clothes up to dry. After the clothes dry, beat them on something or with a rug beater to knock off a lot of the dried up detergent. You can then put them in rinse water to remove more detergent, and you will use less rinse water.

Bountyhunter