how to clean headliner

[SA-focus]

Ive read plenty of threads about headliner stains and how they replaced the whole headliner, but i would like to know how some of ya have cleaned the headliner. My two boys like touching around the back of the car alot and ive noticed some smudges on the headliner that have started to bother me... my ocd... lol. just wanted to make sure its ok to clean the headliner and see what others have done to clean it. i have some scotch guard spray i use on my seats to clean and protect and would like to know if this would work also. May be a simple question but i would just like to make sure before i do so and i wouldnt want to have to replace the headliner if i screw up. thanks for answers ahead of time.