Laundry soap probably accounts for the largest volume of soap used in any modern home. The cost of laundry soap is also a considerable expense, so using the following recipe to make homemade laundry soap can greatly reduce the cost of clean clothing and linens. This simple recipe makes enough laundry detergent to wash 52 loads at the approximate cost of .0225 cents per load. You will need 3 gallons of water, 1 cup washing soda, 1/2 cup Borax and one bar of soap. Heat 4 cups of water to boiling while using a grater to shred the bar of soap