12 cups Borax
8 cups baking soda
8 cups washing soda
8 cups Fels-Naptha laundry soap (grated--hint: 1 bar grated equals 2 cups)
Combine all ingredients and use 1/8 to 1/4 cup per load (half a recipe fits in a gallon ice cream tub so go eat some ice cream so you have room for your homemade laundry detergent!)
Thank you Linley for sharing the recipe!