We have been using my old laundry soap recipe for years and love it but I found one that seems a lot easier.
1 box Borax
1 4lb. box of baking soda
1 box of Washing Soda
3 bars Fels-Naptha Soap
5 1/2 cups Oxyclean
Grate the soap finely in a food processor. Mix in a bit of the washing soda to prevent the soap from getting sticky. Combine all the ingredients in a 5 gallon bucket and stir well.
Use 1 to 2 Tablespoons per load. It comes out to about 3 cents a load. It does a great job and even works in cold water with whites and darks!
I bought the Fels-Naptha here. Some women have told me they can get it cheaper at Walmart or Ace Hardware. Our Walmart carries all of the supplies.
Also, if you can't find Washing Soda, I read that you just have to spread baking soda on a cookie sheet and bake it at 350 degrees for 30 minutes and you'll have washing soda.
I just put it in a glass container and leave it on my dryer with a Tablespoon in it all ready to go. Make sure you keep it sealed or it may start clumping up. It smells wonderful!