ollsanta

My GLK has a light beige headliner, How to clean this headliner? Any suggestions?

kyoshiro

dilute some all purpose cleaner and wipe down

MBRedux

with warm water ... use a terri cloth.

MKenM

If there is a mark or stain remember do not wipe, you should blot the fabric so as not to transfer the mark or stain to another area.

Whatever you try to use as a solvent you should look for an inconspicuous place and try the solvent first to make sure that it does not change the coloration of the head liner.

MBRedux

Pure naphtha works great for removing pen, marker, grease etc.