White clothes need to be washed separately from dark or bright colored clothes. Older clothes and things that were only lightly colored can soak up dye during a wash cycle, which can stain your whites or make them look dull and grey.
Don’t ever dry black and white clothes together. Extreme heat could make the colors run into each other, leaving stains on the clothes that are hard to get out.
I wouldn’t tell you to do it. As a 51-year-old mother of two, I had to learn the hard way which things to wash together. You can wear dull or grayish white clothes if you want to, but I wouldn’t risk it with your nicer clothes.
If you have to wash all of your clothes (both colored and white) at once:
If the clothes are old and the color has worn off, you might want to wash both whites and colors in COLD water at the same time. Before you wash colored clothes with whites, you should wash them more than once. Set your washing machine to the shortest wash cycle and the coldest water temperature. Use as little detergent as possible. Before washing them with white clothes, make sure none of the colored items are brand new. The extra color must be taken out of the new clothes. Most of the time, this takes 3 to 4 washes. The SHOUT COLOR CATCHER should be used.