Cleaned seatbelts with an OxyClean + purple degreaser + hot water mixture. Disconnected belts top & bottom with 14mm wrench, pulled them all the way out and clipped them so they wouldn't retract:
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Let them soak overnight in 5-gallon bucket on the front armrest:
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Next morning, pulled belts outside the car and around the back, held with a bungee cord, closed doors, and hosed them down:
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Belts are shiny new now and retract much better. I also added the tape kit (part no. 73205-48011) to the shoulder loops to help retraction.
Water in bucket was completely nasty, just from soaking overnight:
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TIP: Before you start check the weather for the NEXT day so the belts will be able to dry completely before you let them retract back. I pulled them up onto my roofrack and let them sit there in the sun for a few hours after rinsing.