I needed to remove the Yoshida grips from my track drops so I could put a second set of cut-off MTB grips up at the top of the handlebars. First I tried just rolling them off, which doesn't work. Then I had an idea that worked extremely well. I took a syringe and a 25-gauge needle (I have these lying around from still life photography, where they're used for placing water droplets - I don't shoot up ) and used it to inject rubbing alcohol under the grips in 3 places each. This only puts very tiny pinholes (inconsequential) in your grips and lets you just slide them off really, really easily.