Here's my latest concoction:
1 C. Fels Naptha
1 C. Kirk's Original Coco Castile
1 C. Washing Soda
1 C. Borax
STEP 1: Put 4C. of water on to boil. Once it's nice and hot, not necessarily boiling, add the grated soap. It melts better if you add a little at a time instead of just dumping it all in at once. Make sure it's completely melted... absolutely no lumps!
STEP 2: Add Soda and Borax to a bucket (at least 2 gallon size). Pour melted soap into bucket and stir. Once it's all completely mixed add water until your mixture reaches 2 gallons.
After 24 hours this is what it looked like.
I'll be using about 1/2 C. in each load.
I also kept about 1 1/2 C. of the mixture to use as a "stain paste." With 3 boys and a welder daddy, we have lots of stains.