Yesterday was our day to make laundry detergent, and I was lucky enough to have a helper on hand! I started doing this November 2008 and haven't used store bought since! It's quick (15 minutes!) easy, fun, and makes a ton each batch, so I only need to do it every 2-3 months or so. There are many recipes available on the internet, but I will walk you through ours:
Recipe makes about 2.5 gallons! I just use recycled store bought containers, but milk or water jugs work just as well! When done, I just store all my laundry making ingredients away in the bucket and it's easily accessible next time.