In the same way that there are rules in life for things, like how to drive a car, how to cook a meal, or how to manage your money, there are a few simple rules for how to wash white clothes to keep them looking brilliant and clean.
And if they happen to get a bit dull, gray, or yellowed, there are rules for how to restore the brightness of washable white clothing, too.
Separate
Sort dirty laundry carefully. Never allow items of color—any color, no matter how pale—to sneak into a load of white laundry. Washing white clothes separately prevents the dye from colored items from bleeding and transferring to white things. Even though the effect may not be noticeable at first, this is how white things begin their journey to become dull and dingy eventually.