You can find washing soda at most smaller grocery stores, the baking soda and borax you can find at big name stores like Wal Mart.
I use any bar of soap that I can find, if you want unscented or a certain smell, choose your favorite soap! You can also customize this recipe to use a vegan soap.
Grate the bar of soap with a cheese grater. Then I put all the ingredients together in my food processor and give it a whirl!
Use 1 T per load, and store in an airtight container.