First off you need some Soda Ash. This can be made by pouring plain ole everyday Baking Soda on a cookie sheet and baking for one hour in a 200 degree oven. You will end up with a pile of ash, which is now referred to as Soda Ash or Washing Powder. Pour into an air tight container for storage.
When you are ready to wash those reds and whites, or dark and light clothes, or anything such as that, grab a piece, throw it in your wash and watch the magic. When done throw away the piece of cloth, it has done its job and is no longer good for anything that I can think of.
There you have it! Now wash away.