Homemade Liquid Laundry Soap

A simple, natural, low-sudsing liquid laundry detergent that’s gentle on skin, effective for everyday loads, and safe for HE washers. Makes about 1 gallon (around 32–64 loads depending on usage).

Prep Time10

Yield: 64 Loads

Author: groundedinthyme

Materials

1 cup borax
1 cup washing soda sodium carbonate — do NOT use baking soda
1 cup liquid castile soap unscented or scented, e.g., Dr. Bronner’s
15 cups water divided; use distilled or filtered if possible
Optional: 30–50 drops essential oils lavender, lemon, tea tree, etc.

Instructions

Heat 6–8 cups of the water until very hot (almost boiling).
In a large heat-safe container or pot, add the borax and washing soda.
Pour the hot water over the powders and stir until fully dissolved.
Gently stir in the liquid castile soap (avoid excessive bubbles).
Add the remaining water to reach about 1 gallon total. Stir to combine.
If using, add essential oils and stir.
Let cool completely (it may become slightly cloudy or gel-like — normal).
Pour into a jug or old detergent bottle. Shake before each use.

Notes

• Usage: 1/4 to 1/2 cup per load (start with 1/4 cup for HE machines).
• Storage: Keeps 1–3 months in a cool place. If it thickens, shake or blend.
• Variations: For a bar soap version, grate 1 bar (e.g., castile or Fels-Naptha), dissolve in hot water, then proceed.
• Cost: Typically under $2–4 per gallon.
• Safety: Non-toxic and septic-safe in moderation; test on a small load first. Add white vinegar to rinse for extra softening in hard water.