Here's another cheap,cruelty free, and environmentally friendly household recipe. This formula has many variations, and I've tried (and adapted) several. This one cleans better than any commercially made powder I know of.
Many recipes call for kosher, or iodine free, salt. It doesn't make a difference - just use whatever salt you have.
2 parts borax
2 parts washing soda
1 part salt
1 part citric acid
Mix all four powders together. I just put it all in a jar and shake it up good. I may or may not do this while dancing around to the song with the same name. (Yes, I am well aware that I have issues.)
Use a heaping tablespoon for each load.