I read on one website that you can even use a bar of Ivory soap! I don't know but I wonder how well that cleans? I also read that any castile soap will work. I haven't tried any others but I do like the Fels Naptha. I found it at Walmart. I found the Borax in a Food Giant grocery store.
I did try the Ivory and dearly LOVED how it smelled but couldn't get it to clean my clothes well but it might would work now with this new recipe.