Shred bathe bar soap (makes 2 cups) mix equal parts everything listed. You can switch up scents of course. Makes about 6 months worth - I use about 1/3 cup in large loads.
Grate 1 Bar makes approx 2 cups
Dr. Bronner's Bar Soap - Lavender - 5oz
Add 2 cups
Mule Team Borax All Natural Detergent Booster & Multi-Purpose Household Cleaner - 65oz