This is a very easy recipe!
Shread 1/3 of a bar of Fels Naptha (or I have also used Ivory) and put it into a sauce pan with 6 cups of water and let it melt.
Add 1/2 cup of Washing Soda (NOT BAKING SODA – I found this at Publix grocery store) Add 1/2 cup of Borax Powder and let it dissolve then remove it from the heat.
Pour 4 cups of HOT water into a bucket. Mine is a 2 gallon bucket, then add the soap mixture to it and stir, add essential oil if you want some scent. Add another gallon of water and let it sit for about 24 hours.
Use 1/2 cup of detergent for your clothes. This is super cheap and lasts forever. I've had it not quite gel up right but it still worked fine.