Laundry Soap Recipe:
1-2 bars of soap
1 cup borax
1 cup washing soda
3.5 gallons water
Grate up the bars of soap using a cheese grater. I use two because in my experience it makes the detergent a little thicker. I don't think this impacts the effectiveness of the soap, it's just my preference.
Yesterday we used Fels-naptha and Irish Spring since that's what we had. We've used other bars as well.
Bring 4-8 cups of water to a boil in a medium saucepan and add the grated soap.
Boil until it melts and basically becomes soapy water.
While that is boiling fill a five gallon bucket with the remaining water and the borax and washing soda.
Once the soap is ready, add to the bucket and stir well.