I took the grips off another bike (triumph) to put on heated grips. The mechanic recommended using brake cleaner. It comes in a spray with a little tube to put on the sprayer. I used a small screw driver and worked it under the grip to get enough space to slide the sprayer in. The brake cleaner is alcohol based so it does not leave a greasey residue. Worked great, just slide the grips off after spraying.