1/3 bar Fels Naptha
½ cup washing soda
½ cup borax powder
optional: add natural fragrance with essential oils. Add approximately 1/2 to 1 ounce. I use lavender
Grate the Fels Naptha and place in large pot. Cover with 6 cups of water and heat until soap is melted. Add the washing soda and the Borax and mix until desolved. In a large bucket (I used a 5 gallon bucket) add 4 cups hot water. Pour in soap mixture and stir until well combined. Now add water until mixture is 2 gallons (about 1 gallon 6 cups).
Place lid over bucket and let sit for 24 hours. It will 'gel up' a bit. But more of a watery gel. You use 1/2 cup of mixture per load of laundry. I use an old liquid detergent container for easier use.
This is a low suds detergent, so don't worry if it doesn't seem as soapy as the store bought stuff.
This recipe makes 2 gallons of detergent. Cost per load is below $.20 per load.
A family favorite. I even converted my "Tide is the only thing I use" spouse!