What to Do When the Mazda3 Seat Belt Won't Retract?

[MacMax]

If a car seat belt has been used for an extended period, it may accumulate grease and dirt, primarily from sweat and oils on hands when pulling the belt. Prepare a basin, water, laundry soap, and a brush. Use a clip to pull out and secure the seat belt, then place it in the basin to wet it. Apply soap and scrub off the grease with the brush, then rinse with clean water. Remove the seat belt and position it similarly to how it is installed in the car. Fully extend the belt and secure the central reel to prevent it from rotating. Remove the pin that fixes the belt, then rotate the secured reel a few more turns in the same direction as when pulling out the belt to lock it in place.