Heat 4 cups of water until boiling.
While water is heating Grate your Preferred bar soap ( use a cheese grater or food processor) and add to the boiling water. Stir continuously over medium low heat until soap dissolves and is melted.
Fill your 5 gallon bucket half full with HOT tap water, add washing soda, and borax and stir, add melted soap mixture, stir well until all powder is dissolved.
Fill the bucket the rest of the way to the top with hot water, stir, cover, and let sit overnight to thicken.
The next day it should be lumpy with a partial gel like consistency, stir well and fill old laundry detergent containers, cleaned milk jugs or whatever empty containers you prefer. You can add a few drops of essential oil for scent if you like.
Shake well before each use. Use approx. 1/4 cup per load. If you have hard water you may want to add 1/4 cup white vinegar to your rinse cycle.