Ok I got ahold of some used seatbelts from a friend that are tan which I need to replace my grey ones.

Now how would I go about cleaning the meterial without fading it or damaging it? It's got grease on it and dirt and some unknown tar . They were free, so I kinda want to try to fix them up before giving up and tossing them.

Also the plastic is kinda messed up. So how would one take apart the plastic peices? Not talking about the "winch" assembly. Just the parts where the seatbelts go into and connect together.

Heres an example:

Any help is much apreciated!!