Holy cow... you're really throwing the book at me now eh?
Dye transfer is a HUGE p.i.t.a. on its own - especially on a light colored car.
Overall you'll want to clean the seat belts with as little product as possible (so the dirt/dye doesn't soak deeper into the fabric), and blot the stuff away. The goal is to gently remove the topical grime without allowing it to seep into the fibers.
If you're dead set on truly removing the dye, you'll either need to go to a specialist or replace the seat belt in my opinion. Hope this helps!
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