Originally Posted by Romatsu
I ran into the same issue so I just went to town with the wire wheel on a bench grinder being careful to stop removing grip material when I got to the throttle tube. It did scuff up the throttle tube a bit but was not a big deal.
Thats how the factory tube/grip is. Just buy a new tube.
Sir, you got run over because you were walking to slow for the speed of traffic.