I just finished making my second batch of laundry soap and I thought I would post my favorite recipe. I prefer the powder version (I think it is easier to make/store). I previously posted it in the comment section but I thought I would bring it to light in case anyone missed it.
Powdered Laundry Detergent
1 cup grated Fels Naptha Soap
1/2 cup washing soda
1/2 cup 20 mule team borax
Mix and store in airtight container or bag.
For light loads use 1 tablespoon. For normal loads, use 2 tablespoons. For heavy loads, use 3 tablespoons.
I use anywhere from 1 tablespoon to 1 1/2 tablespoons. I find that I don't need any more than that, even for the dirtiest loads. For my next batch I want to try some Dr. Bronner's soap. Let me know if you come across a sale.