05 S have some discoloration on the roof lining. I have some stuff called 'mothers back to black' that we had for our other car and thats about it...

I'm no detailing freak other than wash weekly and wax once a month or so. Would just putting a coat of wax on it work? pics below

thanks

 

Back to Black will work for a little while but for a better solution get Black Wow.
It is not in most retail but you can order it from many places including Amazon.
Do a search for Black Wow and you can get lots of details on how to use and why it is the best solution.

 

Pick up a bottle of Pre-Wow. I was skeptical on just how little is claimed to be needed - until I tried my 'free sample' from MITM 2010.

I used a small amount on a small round sponge, and I did the entire roof trim. Just did this last night, and it worked wonders on the trim!

 

Seriously Pre-Wow will do wonders on that. Make sure you scrub it a little. Pre-wow will give the appearance that it's removed from the trim with just a swipe, but a little scrubbing will keep it from coming back. You can use the little brush included with Pre-Wow or a towel. The towel will turn black from the gunk being removed.