Interior cleaning tips needed for 2003 X5

[jmj]

I bought a 2003 X5 with gray interior. I want to clean some parts and wanted to know if you guys have tips/advice on cleaning.

-I have a couple small stains on the gray headliner. What do you guys recommend to get them out?

-What tools/cleaners do you use to clean the top of the dashboard?

-My seatbelts are awfully dirty and stained. Anything you recommend for that?

-Part of the carpet in the interior is sort of pink for whatever reason. Any products or methods to getting that out?

-The drivers side seat is faded. The leather seems like it has a yellow crease because it's so worn out. Anything I can do to fix it. There's a lot more wrinkles in it than the passenger side and I wanted to know if I can replace the leather or clean it or what?

-Last one. The armrest because its gray is really bad. It's very dirty. Seems like dirt is embedded in the grain. Any product or tool to attempt to clean it?

Any help on this would be greatly appreciated! Thanks!