So the headliner of my car was saggy in one place (because the sunroof was left open and leaked), so I decided to try, and fix it myself with 3MM adhesive glue. I watched tutorials on youtube of this, and did a pretty good job, all except that I also got glue on the outside of the headliner... And now it looks HORRIBLE. Any way that I can fix this, or anything that I can use to clean it off??? Nothing is working that I've tried. Thanks in advance!

 

Google revealed a 3M adhesive remover.

good luck