If you really wanted to do it by hand, then basically perform the same actions as the washing machine: submerge the clothes in soapy water and agitate them for awhile, then submerge them in fresh water and agitate them for awhile, then wring out the water as much as possible, then hang to dry.
You can accomplish this process with a bucket, a stick, and a rope (plus soap and water). Also a lot of manual labor.
If you really wanted to do it by hand, then basically perform the same actions as the washing machine: submerge the clothes in soapy water and agitate them for awhile, then submerge them in fresh water and agitate them for awhile, then wring out the water as much as possible, then hang to dry.
You can accomplish this process with a bucket, a stick, and a rope (plus soap and water). Also a lot of manual labor.