The so-called dry cleaning refers to removing dirt from clothes with organic solvents (such as tetrachloroethylene and petroleum dry cleaning agent), then drying in a drum at about 70 degrees Celsius, and finally ironing with steam. Dry cleaning can remove grease and dirt from clothes and restore them to their original new state, especially natural fiber fabrics, such as cashmere sweaters, cattle and sheep silk garments, etc.

The most common solvent for dry cleaning is tetrachloroethylene. Some clothes will remain after dry cleaning, and people who inhale tetrachloroethylene will have dizziness, dizziness, nausea and other symptoms. Therefore, dry cleaning clothes can not be worn immediately, and it is best to put them in a ventilated place for 4 hours before wearing them.