This is the laundry soap I make. It is extremely economical, as a batch only costs somewhere around $1.50 to make, and last our family of 5, 2 months! That is only 75 cents a month! Does your laundry soap/detergent give you a month's worth of washes for 75 cents?
I have seen this recipe all over the internet, some with slight variations, many just the same. One of the most common variations, is where the person adds some essential oil to give it a scent. But seriously, essential oils can be VERY pricey, and that kind of defeats the purpose of the economy factor in my book. I have been using this for a few years now, and am very happy with it.
To start, you will need a 5 gallon bucket (nothing fancy, recycled/reused is fine! Just start with a clean one.)
Then you will need....
1 cup Borax
1 cup Super Washing Soda
2/3 of a bar of Fels Naptha soap, or 2 bars of Ivory soap.
Grate the soap into an old pot.
Add about 8 cups or so of water, and put the pot on the stove.
Heat the pot with medium-low heat, stirring occasionally until the soap dissolves.
Add in the Borax and Washing Soda
Continue to heat and stir until the additional ingredients are dissolved. DO NOT let this come to a boil!!! If it boils over, you will have a HUGE mess! Just be patient, and use the low/medium heat.
Pour mixture into the bucket, and gradually add enough water until the mixture comes to about 4 inches from the top of the bucket. Stir it up well, and then put a lid on it and leave it alone. After a day or so, you will have a thick jelly substance.
Use it just like you would any other detergent. I use 1/2 to 1 cup per load, depending on how dirty the wash is, but usually around 1/2 cup.