I have now been making my own laundry detergent for four months, and I LOVE it. It costs SO much less than commercial detergent, works great, and is super easy to do. My standard recipe is now:
2 cups oxygen detergent (I use the generic one from the dollar tree)
1 box baking soda
1 cup washing soda (aka soda ash, I order it from Alice.com)
1 cup Borax (also ordered from Alice.com)
8-10 drops of essential oils
The oxygen cleaner comes with a scoop (about 2 tablespoons, I would guess) and I use one scoop of this mixture per load of laundry.
In the past four months, I have spent about $15 on making this detergent (not including the essential oils). As I stated in an earlier post, I do, on average, 3 loads of laundry a day, so this detergent has cost me approximately $0.04 per load, versus $0.15-$0.22 per load for commercial detergent, a savings of more than 70%!!
Earlier posts on this topic:
Frugal in the Laundry Room
Wash It Up: Make Your Own Laundry Detergent Pt 1
Wash It Up: Make Your Own Laundry Detergent Pt 2