The screen for map etc that I have was replaced and dealer left plastic sheet on screen. Car was not properly fixed and was returned to dealer who held and did not do any work on it. They sold the dealership and I was left with no resolution of work. After picked up the car plastic sheet was removed and there was a black ring around screen where apparently the glue/sticky material got soaked into the screen. Can. anyone advise of how to get the screen cleaned of this problem?