I have a panhead engine (that I do not want to dismantel)..that has silver colored powder coating on cases.Leaking gas and cleaning has made the cases a white-ish color. Does anyone have a tip for removing this powder-coated paint without dismanteling engine or damaging the cases and or gaskets ect.I would like the original case color to show without a polished look from abrasive cleaning...If you have ideas or tips on this it would be greatly appreciated.TC