Begin washing your clothes. There are two primary methods of washing your clothes at this point: you can choose to use your hands and arms to mix them around, or you can use a pole of some sort to stir them from a distance. Either way, work by moving the clothes around in the water to loosen up dirt and grime.
Although they are difficult to come by, if you have an old fashioned washboard you can use that to clean your dirty clothes.
There are some clothes washing tools available that are similar in appearance to a toilet plunger, and work in the same fashion to drown out trapped dirt.