DIY Laundry Soap. Can make this as a liquid version too: melt the "food processed" soap in 6 cups of water on low heat. Then add the borax and washing soda and 18 cups of water. Stir to dissolve. Someone said: I have noticed that using more than one and a half tablespoons (if making the soapy/powder version) will leave a residue in the HE front loader, so I add WHITE DISTILLED VINEGAR as the fabric softener.