- 1 bar of Castile soap (or any natural soap, unscented)
- 1/2 cup baking soda
- 1/2 cup washing soda (or soda ash, which helps with stain removal)
- 10-15 drops of essential oil (optional, for fragrance – lavender, lemon, or tea tree work well)
- 4 cups hot water
- 1/4 cup white vinegar (for extra brightness)
- 1 tablespoon of natural liquid detergent (optional, for extra cleaning power)