How can I remove glue from leather without ruining the leather? We've been doing some leather work and we're using super glue to hold the edges together uniformly before stitching for a better hold.

The issue I keep having is that if there is any glue residue on the leather, the stain I'm using doesn't stain, and instead leaves a rather obvious mark where the glue is.

A few things I've tried:


Sandpaper - this didn't work well. It left scratch marks on the leather that the stain seeped into and it pretty much sucked. I used a fine paper but it still scratched.
nail polish remover - this worked OK but effected the stain. I had to do a couple rounds of using it across the whole project to make it uniform again. Diminished the effects of the glue but didn't get rid of it completely
adding more stain - this didn't work hahaha. just made my project super dark and some what blotchy which I had to fix with more nail polish remover. 


Open to trying people's suggestions and reporting back.
Take a scrap piece of leather and apply several dots of glue to it, then let them dry.  Once they are dry, try each of the following solvents to see which ones remove the glue with a minimum of discoloration to the leather.  Then stain the leather to see how the solvent treated leather accepts color.


clean water, 
water with dish-soap, 
rubbing alcohol, 
acetone (nail polish remover) 
dilute ammonia 
dilute bleach


Never mix the solvents with each other.  Apply each solvent to a separate dot of dried glue using a q-tip or folded paper towel.