Why do white clothes turn yellow after washing them several times? How can it be prevented?

Add a little bleach to your laundry.

There are many reasons for the yellowing of white clothes after washing, with the increase of the number of washing, the fluorescent brightener in the general white clothes will be lost, and the clothes will turn yellow and old. If the yellowing is caused by exposure to the sun after washing, it cannot be recovered; It is also possible that the washing product is left behind or oxidized and yellowed in the air.

Measures to prevent yellowing:

1. Avoid exposure to the sun.

2. The fabric should be kept dry during storage, and the yellowing of the fabric in the wet state is much greater than that in the dry state.

3. Wash off the stains on the clothes as completely as possible before storing them. In addition to water, inorganic salts, and urea, sweat also contains lactic acid, fatty acids, and a variety of amino acids. Organic matter that has not been completely washed remains on the clothing, and after a long period of oxidation, these residual small molecules will undergo chemical changes on the surface of the clothing, resulting in yellowing of color.

Sebum is the same as protein stains.

4. Before storing clothes, add more rinsing times when washing clothes to avoid the residue of washing supplies.

5. When preserving, do not come into contact with leather and belts containing phenolic antioxidants; Avoid using brown paper, brown cardboard, plastic film, heat shrink plastic film that contains phenol antioxidants for packaging and storing clothes.

For clothes that have turned yellow, they can be washed in the following ways:

1. Use bright white and brightening laundry detergent to wash regularly machine or hand wash.

For example, the yellowing of clothing does not improve.

2. Soaking. 1) Pure white cotton, linen and polyester clothing: Add 1 cap (40 grams) of blue moonlight white clothes (Blue Moon Bleaching Liquid Upgrade) to each half basin of water (about 2 liters), stir well, soak in the clothes for 30min, rinse clean.

If the stains are not removed after 2 hours, take out the clothes, add bleaching liquid to the basin (add 1 cap per half basin of water), stir well, put in the clothes and continue soaking, and the cumulative soaking time does not exceed 6 hours.

2) Clothes or colored clothes made of other materials: pour a small amount of water (about liters) into the basin, measure the color stains of colored clothes (Blue Moon Color Drift Upgrade) bottle caps with blue moonlight colored clothes (Blue Moon Color Drift Upgrade), add each bottle cap (60 grams each) of colored clothes and collar to water, and stir well. Soak in clothes overnight and rinse well.

The amount of water should be so that the clothes are just wet, and the net amount of colored clothes and collars should be increased or decreased accordingly according to the amount of water. If the stain remains unremoved after soaking overnight, you can continue to soak for an extended time.

Precautions: White clothes are suitable for white cotton, linen, polyester, polyester cotton, cotton and linen fabrics, do not use silk wool spandex nylon and other non-chlorine bleaching clothes, do not directly use the original solution. Colored clothes are not suitable for clothes that are easy to fade and dry cleaning, avoid touching metal buttons, zippers, metal ornaments, etc. on the clothes when using, and avoid direct sunlight.

If you encounter any questions during the process, you can call Blue Moon 24-hour service **400-111-1118 for consultation at any time, or log in and.

How to wash white clothes that turn yellow:

1. Use an appropriate amount of baking soda, then dissolve it in warm water, and then use this warm water to soak white clothes for more than 6 hours, and then rinse with water to wash white.

2. Add alum method. When washing man-made fiber clothes, add some salt to the water; A small amount of alum can be added to the water to wash high-grade clothes, which can avoid or reduce the fading of clothes.

3. When washing colored cloth clothes, add 1-2 tablespoons of vinegar to the detergent to prevent the clothes from fading.

4. Using an appropriate amount of bleaching powder can be very effective in making clothes white, generally soak them in bleaching powder for about 20 minutes before cleaning, and pay attention to protecting hands during cleaning.

5. Cut some lemon slices into water, boil them into lemonade, and then soak the white clothes for an hour, and dry them directly without washing, and after the clothes are dried, the yellow stains are gone.

The reasons why white clothes will be white and yellow after washing may be due to the following reasons: 1. The detergent is not rinsed clean; 2. Overexposure; 3. Too many times of washing.

1. The detergent is not rinsed clean: after using detergent such as laundry detergent, if it is not rinsed clean, yellow or white stains will appear after drying. The garment can be washed again and dried again and the yellow or white stains will disappear.

2. Overexposure: If the clothes are not dried properly, the ultraviolet rays in the sunlight will accelerate the aging rate of the fabric, and the front will cause the clothes to turn yellow. After washing, clothes should be dried in a cool and ventilated place as much as possible, avoiding direct sunlight.

3. Too many times of washing: After many washes, the whitening agent in the fabric may gradually disappear, making the clothes look yellow and old.