You can do a cleaning and washing in the car, and then put some fresheners or grapefruit peel. The following is an introduction about automobile odor: 1. Note: evaporator is an important part of air conditioning and refrigeration. Most of the moisture and dust will be discharged from the car through air conditioning drainage, but a small part may still be attached to the evaporation box, which will produce mildew and sour taste after a long time. The air-conditioning filter element mainly filters air, and the air will reach the evaporator after passing through the air-conditioning filter element, so the air-conditioning filter element plays the first protective role. 2. Skill: Put the activated carbon in the car into a professional repair shop as a photocatalyst to remove toxic gases.