Do not allow any water, cleaning products, or fabric from cloths to enter the seat belt mechanism. Any substance which enters the mechanism may affect the performance of the seat belt in an impact. Damage to the seat belt can greatly reduce its effectiveness in reducing the risk of serious injury or death in the event of an accident.
Extend the seat belts fully. Specific products for use on interior fabrics are recommended, follow the products instructions. Alternatively, use warm water and a non-detergent soap to clean. Allow the seat belts to dry naturally while fully extended.
While cleaning the seat belt, take the opportunity to examine the webbing for damage/wear. Any wear or damage should be reported to, and rectified by a retailer/authorized repairer.