I had a problem like your a couple of years ago on my 1994 Maxum and I used Soft-Scrub to clean it up. Used a brush with soft scrub on it then I kept spraying on water from a spray bottle and vaccuming it off with a shop vac. It cleaned it up very well and the shop vac removed the soft scrub and water. It took awhile and a lot of spraying to remove the soft scrub, but it worked and I never had a problem since. I know it might not be the best way, but I figured if I messed it up either way I would have to replace the headliner.
Good luck
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