My mom found this recipe on the internet and I have been using it for quite some time. Only...I have been reaping the harvest of her work =). Last night was our first batch made by my own hands. It's quite simple, so lets get to it. I have been very pleased with how well this laundry soap works by the way. Better throw that in there.
1 cup washing soda
1 cup Borax
1 bar Fels-Naptha soap (found in the laundry soap aisle...for locals, Fred Meyer carries it)
First you want to grate the soap with your cheese grater. You put the grated bar of Fells Naptha soap in a pot with 1/2 gallon of water and melt it on low. (I am not patient and don't like to wait around, so I let it get pretty warm on medium high first and then lowered it to medium low.) You want to melt the soap all the way.
While that is melting, put the remaining water, hot or very warm, into a container big enough to hold 5 gallons of liquid. Put your washing soda and borax in there with the water. You will end up with four and a half gallons in for now. When the soap is melted fully with no chunks in it, add that to the big container with the borax and washing soda. Stir it really well until you feel it is equally mixed together.
Then comes the fun part. You have to bottle it up. I like to use old liquid laundry soap containers that are saved, the ones without the button are best. You want a pour spout. Bottle up the soap in whatever containers you have, or you can leave all of it in a 5 gallon bucket and just use it from there every time. It's just easier to store it all and use it in a few smaller containers.
In actuality, I used what I had. I used two large liquid laundry soap containers (the kind with the push button spout), two empty milk jugs (which I also used to measure out each gallon of water), and 1 pour spout liquid laundry soap container. I figure that I will just refill my 1 good container with the other soap as I use it up.
Why is it better to have a pour spout? Well, after the soap sits and cools (overnight) it can get a little clumpy. You will need to shake it when you use it and the clumps get stuck in the press button style.
Use half a cup per load of laundry. Simple as that. It may sound a bit long written out, but I assure you that the process is not very hard once you do it.