I do 1 c Zote flakes, 1c washing soda, 1c borax, a few shakes of in wash scent booster and a scoop of dollar store brand oxy clean. (There’s a scoop in the package). Blend as you go. Sometimes I add some essential oil. That mixture goes a long way. I do a double batch at a time. Inexpensive and good. I buy the flakes because there’s no way I’m going to grate soap. I can usually find it at the Super Walmart or online. I don’t want to make liquid, I just find the powder easier. Note that it’s washing soda, NOT baking soda.