There are so many different recipes for homemade detergent and using the Fels Naptha bar soap is my favorite. The above pic is what the soap looks like grated. You can double or triple the recipe. This batch I used the whole bar of soap.
Homemade Laundry Soap
1 whole bar Fels Naptha (can use other types but I prefer this one) Found in the detergent isle
1½ cup washing soda
1½ cup borax powder
~You will also need a bucket, about 6 gallon size~
Grate the soap and put it in a pan. Add 1 gallon and 2 cups water and heat until the soap melts. Add the washing soda and the borax and stir until it is dissolved. Remove from heat. Pour 13 quarts hot water into the bucket. Now add your soap mixture and stir. Now add 4 gallons plus 2 cups of water and stir. Let the soap sit for about 24 hours and it will gel. You use ½ cup per load. I stirred it several times while it was cooling. My daughter also liked playing in it. lol http://www.thefamilyhomestead.com/laundrysoap.htm (Link where I got the recipe)