About 6 or 7 years ago I stumbled onto a laundry detergent recipe that changed our lives. I have been using this and nothing else since then. When my son was in welding school it even helped clean his dingy, greasy clothes (it wasn't perfect, I don't think anything could clean them totally).
I have adapted this recipe from the original found at White Silk Purse. This recipe makes 5 quarts of concentrate, which will be enough for over 300 loads of laundry!
2 bars Fels Naptha or Dr Bronner's castile soap BAR (or whatever soap you choose, I can't guarantee it will turn out)
2 cups 20 Mule Team Borax
2 cups Arm & Hammer Washing Soda (Not baking soda)
6 1/2 - 7 cups of hot water (more water if needed, I have only needed more to make exactly 5 quarts)
5 wide mouth mason (canning) jars with lids
In a large stock pot or similar size pot, heat water. Grate the Fels Napatha. If you have a food processor this works great with the shred attachment. Cut the bars so they fit into the tube of your processor. Otherwise, a box grater is fine, you will build some muscles. lol
Add soap to the heated water, and stir. A LOT until melted. Be very careful not to let it boil because it can become quite the mess, trust me. If this is taking too long to melt, which it always has for me (over 15 minutes), I use my immersion blender to help speed things up. Or I keep the heat low and walk away while checking and stirring frequently to make sure it's melting and not out of control. If using the immersion blender, be careful! It can spray hot, soapy water at you. I only bring this out if it isn't melting after 45 minutes.
When finally melted, remove from heat. Add Borax and Washing Soda. This is where your immersion blender is AMAZING. It helps to dissolve the granules and give it a nice "paste" quality.
Pour the liquid equally into 5 quart jars. Add enough water to bring the paste to the “shoulders” (just under the neck where it starts to bow out) of the jar. Thi