hot dairdryer and dental floss!
and then get blisters on your fingers as you rub the residue off...all good fun, but worth it...will be doing mine tomorrow if the weather is any good.
nearly but easier way
plastic card scraper, bank card (or Ni Card) will do fine *** dont use Drivers licence you may break it and nobody likes shelling out 20 notes for a new one
and then to get the sticky off use a rubber toffee wheel (found in all good halfrauds) put that on the drill werrrrrrr it away... **dont be too rough it can take paint off but if your sensible its fine
the toffee wheel was standard issue when i worked at romford and essex accident repair as a technician