I have some marks on my lite grey headliner. Is there any technique or product that you can suggest to clean it?

Rick
90 GT
stock

 

I'd try a mild cleaner maybe something like simple green or some spray on carpet cleaners. Apply, let it sit for a few then blot out the marks. Heavy marks you may need a brush or something to scrub

 

After I'd had my previous car in for service once it was returned to me with greasy fingerprints all over the A-pillar (same fabric as the headliner in this car). I bought a spray bottle of upholstery/fabric cleaner from the auto section at Can Tire and it cleaned up the grease first time, no problem.

 

there are numerous brands out there that work well....K2R Spot Remover is one..RESOLVE is another....just get something that is specifically made for FABRIC....and you will be fine.