1 cup washing soda (like Arm & Hammer)
1 cup Borax Detergent Booster
1/2 cup Citric Acid (optional)
1/2 cup Salt
10 drops doTERRA essential oil (Lemon, Wild Orange, OnGuard, or Purify)
Mix together and stir. Store tightly covered in an 16 oz glass jar. Use one tablespoon per load with hot water.
I took the top off an old salt container and put it on a wide mouthed mason jar so I had a pour spout. Works great!
Note: Use vinegar as a rinsing agent.