This really was super easy to make!
2 cups Borax
2 cups Arm & Hammer super washing soda
1 bar Fels-Naptha stain remover soap
(i found them all in the laundry aisle at Wal-mart)
I purchased a betty crocker fine grater at the dollar store that i will use just for this
grated the fels-naptha bar of stain remover soap while Naters worked on her workboxes; then mixed it with 2 cups of Borax and 2 cups of the Arm & Hammer super washing soda. voila! laundry detergent powder! First I tried it on a load of whites and was very pleased.