Baking soda helps to regulate the pH level in the laundry rinse water by keeping it from being too acidic or alkaline. Adding 1/2 cup of baking soda to each rinse cycle acts as a balance to suspend detergent or mineral deposits that can make clothing feel stiff.
As a natural mineral, baking soda is less harsh on the environment than synthetic fabric softeners with perfumes that mask odors. This also makes it a good choice for those with sensitive skin and allergies. Unlike synthetic fabric softeners that can interfere with fire-retardant finishes on children's pajamas, baking soda can be used safely.
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