Can you reuse handlebar grips?
Grab the grip and pull it off the end of the handlebar. Reusing the same grips can be done in one of two ways..if the grip is really tight going back on and does not need to be glued in place, just wet the inside of the grip with water and slide it on the bar.
How do you remove foam grips?
Just use hairspray. It goes on slippery then dries sticky. slip some under the grips to get off, then put some more on when you slide them back on.