I use:
1/3-1/2 ivory bar soap(grated)
1/2c washing soda
1/2 c borax
I melt the soap in 4c water. on the stove. Place borax and washing soda in a 2-21/2 gallon bucket
and in 6c HOT water. Stir well until dissolved. Pour in melted soap. Add 1 gallon and 4 cups of water. Let sit over night. Break up clumps then leave in bucket covered or pour into smaller containers. I use 1/2c to 1c per washing load.
Kellye