I recently placed one of those rubbery non-slip pads used to keep my cell phone from flying around inside my 2005 TSX. Pretty handy, but after several weeks, it has left a splotchy residue on the plastic cupholder lid which I can see but cannot feel. I've gently tried to remove using Windex, 409, Mister Clean, even ArmorAll, but nothing seems to work. Any advice on how to remove without leaving scratches or destroying the finish?