Washing clothes of different colors separately is a good preventive measure. Try to wash white clothes, light and light clothes, similar bright clothes, dark clothes and towels separately.
Putting clothes into different laundry baskets according to color can help you sort out and pay attention to the clothes that need cleaning.
Reduce friction. A large amount of friction will lead to fine cracks in fibers and release dyes between fibers. This is also one of the reasons why clothes will fade after washing many times (especially cotton clothes). Washing heavy clothes (such as jeans) together can reduce friction. Remember to zip up and button up.
You can also turn the clothes upside down to reduce the friction on the front. This is especially effective for jeans.
You can also try to use the paddle-less ironing cleaning program, which is milder than the ordinary cleaning program and helps to protect clothes. Test the color fastness of clothes. Before washing clothes, you can test the color fastness (dye durability). Fill the sink with soapy water and soak the clothes in water for half an hour. If the soapy water changes color, it means that the clothes will bleed, so you need to pay special attention when washing.
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When washing clothes
No salt or vinegar. Some sources may suggest that you wash clothes that are prone to bleeding with salt or vinegar, but this is not a good idea. Some clothes use vinegar to fix the color of the dye (which is also the basis of the above suggestions), but this dye is relatively rare. Moreover, vinegar will actually destroy other types of dyes, so it is best not to use vinegar in laundry. They are not only useless, but also damage clothes!
However, vinegar is very effective in eliminating strong odor. Ordinary underwear, socks, fitness clothes and towels can all be washed with vinegar. Wash clothes with cold water. In the past, because the effect of laundry detergent was not very good, it was a good choice to wash clothes with hot water to ensure that the clothes were clean enough. However, the detergent is still quite effective now. Only mattresses, towels and white clothes need to be washed with hot water. Basically everything can be washed with cold water.
If you live in a cold place, you may need to make some adjustments. The water in winter may be too cold. If you know it's cold outside, you can set the washing machine to "warm water". Use antifouling cloth. If the clothes are still easy to bleed, you can use anti-staining cloth, which is sold in most shops selling laundry supplies. They can absorb falling dyes and prevent other clothes from being dyed.
If the clothes bleed badly, you can choose to wash them by hand or send them to the dry cleaner next time. If you change the washing method, but wash it once or twice, the clothes will still bleed easily. If you just want to clean clothes simply and don't need to remove dirt or dust, you might as well clean them with steam. Steam can sterilize and remove odor, but it can't remove dirt.