You will need:
1 bar Fels Naptha soap, shaved
4 cups hot water to melt the soap
3 gallons hot water
1 cup borax
2 cups washing soda
1 cup baking soda
1 large container about 4-5 gallon size
Grate the soap into a saucepan. You can use a box grater or food processor.
Add 4 cups hot water to the pan. Simmer on low until the soap melts completely into the water.
Add borax, washing soda and baking soda to the hot water. Simmer on low until it dissolves with the soap. If the mixture is not melting, add a little more water.
Keep an eye on it so it doesn't get all bubbly and almost overflow onto the stove! Yikes! Almost had a disaster!
Add 3 gallons of hot water into the 5-gallon container
Add the mixture to the hot water.
Mix with a large spoon until it completely dissolves.
Let it cool overnight. It will turn into a thick, goopy gel. I gave it another good stirring after it was cool to break down some of the globs. I have a front loading machine, and I use about 1/2 cup per load
Have a happy laundry day!