There can be the following three easy methods:

1, salt application method

Use: the most suitable for the removal of grease stains on the clothes, such as meal oil stains, especially for light-colored clothes and pure white clothes are very effective.

2, lemon juice + salt

Use: fresh lemon juice can be applied to the stains, and then smeared with salt, ten minutes before cleaning, you can effectively remove yellow stains.

3, vinegar + lemon juice

Use: yellow towels or white socks, you can use lemon juice heated and boiled, the effect of yellowing is very significant.

Extended information:

1, with disinfectant or bleach to bleach

For pure white clothing can be disinfectant, bleach to bleach. Clothes with disinfectant solution to water directly soaked for a while, and then rinsed clean; bleach according to product instructions dosage of water, and then soak the clothes, rinse to wash a few more times to reduce the residue. This method is only for all-white clothes, other colorful clothes are prohibited.

2, water rinsing method

In the water into a few drops of blue ink (not too much), and then stir, and then put the clean white clothes into the water a few times, drying can be.

3, with white vinegar, lemon water soaking method

In the water add white vinegar or lemon juice, and then white clothes soaked into the water, and then rubbed washing, the effect is good.

Reference: phoenix.com - lemon white vinegar simple solution to white clothes yellowing