I got this recipe from my mom who has been making this for a while. It only ends up costing .01 -.02 per load! I haven’t personally made this yet but I sure plan on doing it when I run out of what I have.
Homemade Laundry Detergent
1 bar of Bar Soap(such as Ivory)
1/2 c. Borax
1/2 c. Washing Soda
Grate the soap and put it in a sauce pan. Add 6 cups water and heat it until the soap melts. Add the washing soda and the borax and stir until it is dissolved. Remove from heat. Pour 4 cups hot water into the bucket. Now add your soap mixture and stir. Now add 1 gallon plus 6 cups of water and stir. Let the soap sit for about 24 hours and it will gel. You use ½ cup per load.
My mom also adds a few droppers full of an essencial oil such as orange or lemongrass.