As a soapmiller, I've grown to hate detergents. Real soap cleans better and gentler. This is my personal recipe for homemade laundry soap. I chose to use Castile soap from a batch I thought turned out ugly--and what better way to use it than to grate it up for some homemade laundry soap! Since Castile soap suds less than most soaps, it's great for HE washers. The only thing I've found is that it needs warm water instead of cold water.
If you only use cold water, consider using another kind of soap like coconut oil soap.
First, gather your supplies. You will need a bar of soap that is 3.5-4oz, borax, washing soda, a cheese grater, a spoon, a measuring cup, and containers to store your laundry soap.
This recipe will make enough laundry soap for about 12 loads.
Right now, the +New Step button is broken for me, so bear with me. Everything's in this step.
1. Grate your bar of soap into the plastic container you will be storing your soap in.
2. Add in 3/4 cup of borax and 3/4 cup of washing soda.
3. Mix well until everything is evenly distributed.
4. OPTIONAL: add in a few drops of pure essential oil to give your laundry soap fragrance. Try eucalyptus or lavender.
5. Put the cap on your container and store in a cool, dry place until you're ready to use it.
6. For each small load of laundry, use about 1/3 cup. Use about 1/2 cup for medium or larger loads.