Use cold water
Delicate fabrics, such as silk, wool, and lace, should be washed cold to avoid damage such as shrinking or stretching. In addition, colored clothes should also be washed cold to prevent them from fading or dyeing other garments. You can also cold wash garments that are lightly soiled or have no stains whatsoever. And lastly, you should also wash synthetic fibers such as polyester, nylon, and spandex cold.
Use hot water
Underwear, bath and kitchen towels, bed linen, and items that have been used by people who are sick or have contagious diseases need to be disinfected and therefore should be washed at higher temperatures. Dust mites, bacteria, and other germs are eliminated with hot water, because the water temperature is so high that they cannot survive. White clothes and linen should be washed at some temperature to maintain their shine and color. Very dirty clothes or clothes with grease, oil, or food stains should be washed with hot water as it helps remove these types of stains.
Remember to always check the care label on your clothes before washing to make sure you are using the correct water temperature and washing instructions.