A product called FINNESSE IT.Rub on with a cloth and overspray diisapears.It less abrasive than T-CUT.Could use T-CUT as a cheaper and quicker option,just be careful you don,t go mad with it as it will take a few layers of paint off.Also G3 is a very abrasive cutting compound.Our body shop uses FINNESE IT for overspray.Think you can get an something similar from HALFORDS.