I just lift up the edge and then spit under the grip. Then just ease the grips off.
if you use stuff like WD40, it would be difficult to get rid of the residue inside the grip and then with hairspray it just makes it more difficult to get back on.
easiest way to get them off would be an air compressor, and then to get them back on just use some windex. it evaporates without leaving an oily residue. I would recommend using the real windex with teh streak free on that bottle. I think the stuff that isnt streak free will leave an oily residue which will then keep the inside of the grip oily, therefore itll slip