You DO NOT need to remove your seatbelts to get them clean as new. I just purchase a 98 100 with 265k miles on it. Tan interior and the tan belts in front were almost black with 15 years of spillage, oil from hands, and other assorted spillage. A quick Google search and I found that detailers extend the belts to their maximum length, pull them outside the doors and close the doors so the belts hang outside the vehicle. Simply saturate with a NON-petroleum based degreaser (I used citrus based), let it soak and hose off with high pressure stream of water. My belts look NEW. Sure, my clothes were soaked, but it was worth it. My wife wouldn't get in LC before, now she want to make it her own. What have I done?
Great first post. Welcome!