What is the best way to clean the interior headliner and cloth side pieces. I've got a 2010 G37S silver ext with black and light grey interior. The headliner and side panels have built up quite a bit of grime. Kinda looks like a white shirt that turned grey after a while.

 

https://www.myg37.com/forums/car-car...eadliners.html

-Zach