1 cup borax
1 cup washing soda (I use Arm & Hammer)
½ cup citric acid
½ cup kosher salt (for scrubbing action)
Combine and store in a container. Each batch yields 24 ounces of detergent. Feel free to double the batch, or multiply to create any amount you’d like.
Use 1 Tbsp per load; more for heavily soiled items