Okay so here is what you will need:
Water
Zote soap ( but I hear any bar of soap will do)
Borax
Arm and Hammer Washing Soda
5 gallon bucket
So to start you take a pan and boil 4 cups of water in it. While you are waiting for the water to boil you grade your bar of soap.
Then you turn down the stove to medium after the water has come to a boil and slowly start to add a little bit of your grated soap at a time. Continue to stir it until it all melts and turns into hot soapy water. By the way its way hot, I burnt my finger when it splashed on me so watch out!
This next step I think is easiest done in the bathtub. You take you 5 gallon bucket of water and fill it up half way with hot tap water. Then you are going to add 1 cup of Arm and Hammer washing soda, stir until it has dissolved. Next you will add 1/2 a cup of Borax and do the same. Last you will add your soapy water mixture to the bucket and stir. Fill the bucket the rest of the way and stir. Then you cover and let it sit for 24 hours. When you are done you will have a more solidified mixture.
Be sure to stir the mixture before every use. What I do is take my old laundry detergent bottle and just fill it with my mixture so I don't have a 5 gallon bucket next to my washing machine. Now if you want your laundry detergent to be extra strong you can leave the mixture just like this and use 1 cup per load. Another option is to fill your old laundry detergent bottle half way with water and then the rest with your mixture. This works just as well. Just make sure to shake the bottle before each use either way.
This works out to be about 2 dollars per 5/10 gallons depending on how you use it. Saves TONS of money and works awesome too!!
Those of you that try it let me know how it goes :)