There are many ways to make your own laundry detergent but not all formulas are non-toxic. For example borax, a popular do-it-yourself laundry detergent additive is quite toxic to humans. Check out this very simple and non-toxic recipe for a natural liquid laundry detergent.
2 1/4 cups of castile liquid soap (use Dr. Bronner’s)
1/4 cup of distilled white vinegar
3/4 cup water
* Optional 1 tablespoon glycerin (if you require thickening agent)
* Optional – 15 drops essential oil (i.e. lavender or any anti-bacterial/anti-fungal)
Whisk solution and it’s ready to go. Use 1/4 cup for a regular load or 1/2 cup for an extra large load.
Source: Prevent Disease