I have a YouTube of my wash up method on wilderness canoe trips.
you need the liquid soap,Campsuds.a few drops will do the job.
boil water in a small pot and add to cold water in a bigger one to get the right temp.stand on your dirty clothes and wash your hair with the soap and rinse a bit using the water to wash more.
rinse with the rest.the clothes can be rinsed out in you water source.the soap can be used in any water that's what makes this work so well.if your in a real survival situation a cold bath is all you can expect as you don't want to waste time and effort on the real thing.i use a small cook pot and Platypus bags.