[header] How to get white clothes white again [title] Soak in baking soda. [step] 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. [substeps] Baking soda deodorizes while it whitens, so this option has multiple benefits.