If you don't ever think you'll use them again, you can cut them off. What I do to remove and install new ones is to take a long, skinny screwdriver and carefully insert it between the bar and grip. Then I take a can of contact cleaner with straw attached and squirt just a bit up there. Then I wiggle it off, or on. You may want to test it on the grip first to make sure it won't melt it. I used something by accident once that melted the grip, but I can't remember what.
I've also heard compressed air works well.