Washing soda can be difficult to find. If you've had no luck locating it so far, here are some ideas as to where you can look.
DIY Laundry Detergent - Simply combine washing soda and Harris Borax in equal parts plus soap flakes or castile soap for a homemade detergent Laundry
Harris Washing Soda, Sodium Carbonate, Laundry Booster and Multipurpose Cleaner, 10lb
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Meliora Laundry Powder is a powerful non toxic eco friendly laundry detergent. Available in a plastic free container or in bulk refill bags. All Meliora eco laundry detergent powders clean clothes without harsh chemicals, synthetic fragrances, dyes, preservatives, and brighteners. Use for 128 HE (64 Standard) Loads.
Meliora Laundry Powder - Lemon
How to Make Washing Soda If You Can't Find It In Stores
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What Is Washing Soda and How Is It Used?
What Is Washing Soda and How Is It Used?
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How to Make Washing Soda: Learn This Simple and Inexpensive Process!