I am new to making my own detergent, but I have tried a few ways and this is the one I like the most.
It is really easy and cheap, and it makes a lot from a little.
2/3 of a bar of Castile soup.
(I used the other 1/3 to make two batches of kids shampoo/wash)
1 cup of Borax
1/2 cup of Baking Soda or Baking Wash
5 gallon bucket
Grate down the castile soap.
Melt it into 5 cups of simmering water.
Add three gallons of hot water to the bucket.
Add the Borax & Baking Soda to the hot water.
Once the Castile soap is fully melted, add it to the hot water mixture.
Cover and let it sit for at least 24 hours.
This is the final product!
You use 1/2cup per load, so the batch will wash approximately 64 loads.