Ran across this recipe on diaperswappers...
1/2 cup Borax ($3.29 a box- $0.17 for this)
1/2 cup Baking soda( Dollar store box $1.00- $0.25 for this)
1/4 cup Salt ($2.00??- $0.03 for this)
2 packs lemon koolaide- $0.25 a piece( I used 3 True lemon samples I had, You need citric acid.)
total $0.95 Each load costs..................... $0.09!!!