Wipe it with gasoline or tailor oil, and the cloth will turn yellow (wet it first), which is very effective. Because the main components of gasoline are alkanes and aromatic hydrocarbons. Generally, it can dissolve dirt (such as ballpoint pen oil, paint, bayberry water and other small polar or nonpolar substances) that is difficult to remove with laundry detergent. It is also used in rubber, shoemaking, printing, tanning, painting, washing and dyeing industries, and can also be used as a cleaning agent for mechanical parts. Then use soap or deodorant to remove the odor of gasoline (it may not be complete once, so it is recommended to wash it several times, and the effect is obvious).