Grips are one of those bike parts that have to be replaced if you have ridden much. An easy process to remove an old bike grip is to cut it off. Although, if you want to save the old grip, you will have to use some material to detach it so that no harm happens on its surface. Furniture polish, glycerin, mineral spirits and hair spray are lubricants that can be used to detach the grip from the handlebar. For instance, if you use furniture polish, you have to take a thin screwdriver and spray the furniture polish. Insert it between grip and handlebar and push it around. Now, move the grip around till it detaches. The same procedure applies to other lubricants.