Heat 6–8 cups water (hot, not boiling)
Whisk in washing soda and baking soda until dissolved
Add Epsom salt and stir
Pour in remaining water and let cool to warm
Gently stir in Castile soap (no aggressive mixing)
Optional: Mix essential oils and polysorbate, then stir in
For HE machines use 2–3 tbsp per load
For standard machines use 3–4 tbsp per load
