Fill a 5 gallon bucket half full with HOT water. Grate 1 bar Ivory or Dove soap bar and half of a Tom's of Main soap bar into sauce pan with 4 cups of water and heat until dissolved. Add soap/water mixture to the half full 5 gallon bucket. Add to the bucket 1 cup Arm and Hammer Washing soda (not baking soda...washing soda can be found in the laundry section in most major stores) and 1/2 cup Borax. Stir well to completely combine ingredients and fill the bucket to the top with more hot water. Stir again and let sit for 24-48 hours to do it's "thing". After that you can add some essential oils to the mixture if desired. I like to use lavender, orange, lemongrass...ect...about 20 drops.
You can either leave the mixture in the bucket and scoop out 1 cup per load (1/2 cup for front loaders) or funnel it into pourable containers like recycled laundry bottles, milk jugs or even pitchers.
The liquid will be sort of "goopy" but it you pour it into the flow of water when you turn your washer on it will dissolve right away. Other wise, like for a front loader you could add a bit of water to it before adding to the wash.