Take out the seat belt spool, (the whole assembly that the belt retracts into) pull the belt out all the way. Spray just a little bit of wd40 or litium grease on the spool that holds the seat belt. Dont get it all over cuz you dont want greasy seatbelts. If you can, I dunno if theres a cover on there that you can safely take off or not, tear into the thing and clean it out.