So this has been floating around on the internet for some time, and in fact I found it on pinterest. You can go here to link back to the original. I don't take credit for making this up, but I did modify it a bit. So here's the recipe:
1 4 lb 12 oz box Borax (2.15 kg or 76 oz) found in the detergent isleUse 1 tablespoon for a small load, two for a large.
1 4 lb box Arm & Hammer Baking Soda (1.81 kg) found in the cooking isle
1 box Arm & Hammer Super Washing Soda 55 oz (3 lb 7 oz) found in the detergent isle
3 bars of Fels-naptha soap, found in the detergent isle
2 small containers of oxyclean or store brand oxyclean (try to get about 3.5 lbs total (1.58 kg)) found in the detergent isle.*(optional, see below)
The three bars of soap you will want to grate with a large holed grater. Don't worry, it dissolves just fine. If you have a traditional top loading washer, I recommend putting the scoops in first, let it fill about 2-3 inches and then put in your clothes.
So, there is the recipe. I mixed it up and put it in a large sealed container and use a small jar with a flip-lock lid. This stuff is perfect for high efficiency machines because it does not foam. This will freak some people out, but don't let it. Its still cleans quite well. The majority of your pre-made detergents have softeners and other chemicals that make it foam because people associate that with 'clean'. Its really a marketing trick.
Given the rate at which we do laundry 'round here this $20 worth of product will last about six-nine months. Possibly longer, but that remains to be seen. And it seems its fairly hypo-allergenic.
*On to the optional part. The 'oxyclean' is a brightener. Yes, it does help remove stains but it also acts to makes brights brighter, and so on. I left it out, but still bought a container to add to things such as sheets, towels, whites, and jeans. If your family wears a lot of black (like mine) don't add it because it causes dark colors to fade faster. If not, well, feel free to add it. Also, if you don't add the oxyclean this works well for woolens (just don't put them in the dryer, but you should know that already).