Removing grip - what fun!!
I have found the best way to remove grip is with a heat gun.
Gently heat up the grip and the glue will release.
I have removed and re-gripped (with contact cement) a complete C4 grip this way.
JUST DONT BURN THE GRIP or the board Javascript:insertsmilie('

')
We actually have off cuts of this PSH grip if anyone wants to give it a try.
We also have it in sheet form - 23" x 28"
Keep on paddling!
Andrew.A