Just bought the Mrs a new car, previous owner was a little exuberant with polish on the exterior plastic trim. It may be common knowledge ( I didnt know) but to remove it rub the surface with a cloth dipped in smooth peanut butter and polish off, no more white polish residue. Works on bikes too.
What you don't notice is that all the local dogs come along and lick your bumper!!..that's why it stays clean, LOL..