How to remove the glue stain on shoe sole?

I was applying some super glue to stick back my glue sole. However, some of the glue stained the shoe sole, as shown in the picture below. I have tried using turpentine, but to no avail. Is there any other ways to remove the glue stain?

Chemicals might do more damage than help. I would try some fine sandpaper and a good amount of careful and patient elbow grease.

Recommendation: next time please be A LOT more careful. Or take the shoes to a specialist for repair. Some spill might be expected when the job is done by a non-specialist, but here we are looking at some "horror movie".