How to Make Homemade Laundry Detergent Powder 10 cents per load and step by step tutorial. Ingredients: ◦1 (55 oz.) box of Arm and Hammer Super Washing Soda ◦1 (4 lb.) box of Arm and Hammer Baking Soda ◦1 (76 oz.) box of Borax ◦2 (400 g) bars of Zote Soap (or 3 bars of Fels Naptha Soap) ◦3 (lbs.) OxiClean ◦1 (13 oz.) container of your favorite Downy Unstopables scent (totally optional for added fragrance)