What causes odors inside an Audi A4?

[DiCassidy]

Audi A4 interior odors may be caused by sound insulation cotton, vibration damping pads, and interior materials. Solutions are as follows: Ventilation method: For the first six months after purchasing a new car or after decoration, develop the habit of moderately opening windows while driving to maintain fresh air circulation inside the vehicle. Chemical product method: Herbal formaldehyde remover, a general term for plant-based solutions, can be sprayed on floor mats and seats to decompose new car odors. Activated charcoal method: Place activated charcoal inside the new car. Higher-quality options include using Ye Guangni material, which can be reused. Vinegar method: When the car is not in use, place a small bucket of water with some vinegar inside the vehicle. The water can absorb formaldehyde while the vinegar helps stabilize it.