Grate and melt a bar of Dr. Bronner’s soap in 2 quarts of boiling water. Fill a 5 gallon bucket with 4 gallons of hot water. Pour in the melted soap, along with 1 cup Borax and 1 cup washing soda and mix well. Leave at least 24 hours with lid on, then open and stir and it’s now ready to use! Use 1/2 cup per load of laundry.