just cut mine off to replace with oxford hot grips. theres no glue on them, but the throttle side will be very hard to salvage as it has ridges underneath to keep from slipping .
Squirt WD40 under the grips with the little tube that comes with the can. You may need to slide a thin bladed screwdriver in as you are doing it. Twist the grips and they come right off. No problems.