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DIY Fabric Whitener It is SO simple and cant believe that it works. You take one cup of cream of tartar (used in baking for some frosting to make them white, so thats why this makes so much sense) and three cups of water. Mix together in a clean bucket and let your-at one time white shirts- soak and enjoy a fresh white shirt after washing in a regular cycle.
DIY Fabric Whitener: Mix 1 cup cream of tartar with 3 cups water in a clean bucket and let white items soak one at a time before washing in a regular cycle.