The macula or macula is due to the fact that sweat and various feeding nutrients contain not only a large amount of water and a small amount of salt, but also organic substances such as protein and urea. These substances, especially organic substances such as protein and urea, will combine with dust to form some stains that are difficult to clean. Maybe the clothes were not cleaned last time, so these stains will show up after a long time.

For yellow stains, there are the following cleaning methods.

Method 1: Wash with rice.

Taomi water is weakly alkaline, which can react with the grease in the stain and become other water-soluble substances. First soak the sweater in rice washing water for about 20 minutes, and then wash it regularly.

Method 2: lemon juice or white vinegar lemon

This is actually the use of acid-base neutralization reaction. After neutralization reaction, some residues left in the imprinted part can react with yellow marks and also remove yellow stains.