Join Date: Jul 2007
Location: New Zealand
Rather than water/soap, I would start with brake cleaner sprayed onto the headlining without touching/rubbing, with a container held underneath to catch the drips. Brake cleaner is an excellent oil solvent. Small risk that it might penetrate and loosen the headlining adhesive, but as long as you don't rub the surface, I think you'll be better off than using soap. Try it first anyway, there's bound to be some improvement.