How to wash a white shirt to be as white as new?

Shirts are one of the essential items in everyone's wardrobe, and the cleaning of shirts is very special. Wearing a white shirt for a long time will cause a lot of sweat stains on the collar and back. Although washed repeatedly, it will still turn yellow after washing, which makes everyone very uneasy. Please help me to see if there is any good way.

When cleaning, soaking is necessary, but the time should not be too long. Put the washing powder on the cotton and soak it for 35 minutes at most. If there are stains on the collar cuff links, you can rub them properly. If there is no stain, soak it. When the washing machine takes out the shirt before the dehydration process, simply folding and dehydrating can reduce the formation of wrinkles. Chemical fiber shirts don't need to be wrung out. As for cotton and wool, it is not allowed to be dried directly with water, because the gravity of water will make the elasticity of clothes reach the limit and thus deform. Therefore, it is best to lay cotton casual shirts flat on a non-absorbent surface.

Buying a bottle of 84 disinfectant in the supermarket and soaking it after dilution can obviously improve it. At the same time, strictly follow the instructions and control the concentration and time. A small amount will not achieve the effect, and a large amount will damage the clothes. Boil the lemon slices in water, then soak the clothes in lemon water 15 minutes. Soak the clothes in 5% salt water 1 hour, then rub them slowly, then soak them in 10% concentrated salt water 1-2 hours, take them out and wash them with clean water instead of hot water.

When the white shirt turns yellow, sprinkle some salt powder on the yellow spot, gently wipe it, and then wash it with soap. Repeat the above steps several times. Because white shirts are mainly dyed yellow by sweat for a long time, and sweat is mainly protein, which will dissolve quickly in salt solution. If there are obvious signs of yellowing, scrub with ammonia solution, and then rinse with water, you can look brand-new!

Don't wash white clothes with hot water, because it will turn yellow. White shirts must be changed frequently. After changing clothes, now apply washing powder to the neckline, cuffs and front, and then wipe it. If it is particularly dirty, brush it with an old toothbrush and then wash it with a washing machine or hand. Don't use washing powder and soap at the same time, they won't clean.