: a transparent crystalline hydrated sodium carbonate
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Additionally, washing soda saponifies fat and alcohol prevents streaks.—Shagun Khare, The Spruce, 23 Feb. 2026 Use Borax and Washing Soda Add one-fourth cup of borax and one-fourth cup of washing soda to the washer drum.—Mary Marlowe Leverette, Southern Living, 10 Nov. 2025 This powerful powder is made from natural ingredients such as baking soda, washing soda, and citric acid for a gentle yet effective clean.—Amber Smith, Discover Magazine, 22 Apr. 2023 The laundry stripping recipe involves adding borax, washing soda (sodium carbonate — not baking soda) and laundry detergent in a 1:1:2 ratio.—Amanda Garrity, Good Housekeeping, 15 Apr. 2022