Recipe for laundry soap

Grate old bars of soap with a cheese grater and then put those in a food processor or blender.

Use 2 parts Borax, 2 parts washing soda and 1 part grated soap. Put in a container and use up to 1/4 cup per load.

http://www.hometalk.com/search/posts?filter=diy%20laundry%20soap

The recipe I used is one 5.5 oz bar of Fels-Naptha grated, 1-1/4 c Borax, 1-1/4c Arm and Hammer Washing Soda. Blend together in a food processor to make a powder. Use 1Tbsp for small load, 2-3 Tbsp for larger or more soiled laundry.

I'll be honest, this may be cheap and the clothes do smell clean, but my whites were dingy, even with bleach, and I'll only go so far to save a few bucks. Could be that you really need to add more than the directions said or maybe my clothes are just dirtier than everyone else. Try a small batch and see how you like it. If not, the Borax and washing powder can be added to your regular detergent as a booster and odor eliminator so it won't go to waste. And all three ingredients are cheap.

Note: Another poster suggested using old bars of soap. I haven't seen any recipe that called for anything other than castile soap (Fels, Dr. Bonner's, Ivory, etc) for laundry. Since most of today's bath soaps are loaded with oils, fragrances and other additives meant for use on your skin, I'd wonder if it's good for clothes. Then again, I'm not so sure castile is all that great either since Ivory leaves a nasty soap scum in the bath water! Good luck!

http://organizedheart.blogspot.com/2012/02/its-good-day-for-myo-laundry-soap.html I've made this soap and it's all I've used for years. My whites stay white. I've been very happy with it.