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How to get white clothes white again
Soak in baking soda.
Combine 4 quarts (4 l) warm water with 1 cup (250 ml) baking soda in a sink or basin, mixing well until the baking soda dissolves. Soak your dingy white clothes in this solution, making sure that each garment is submerged.
Let it soak for about 8 hours. Baking soda deodorizes while it whitens, so this option has multiple benefits.