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I noticed last night that the black insert on the rear bumper already had a chalky-white streak down along one side. I have a bottle of STP silicone spray and used some of that on an old washcloth to remove it. While I was at it I treated the whole insert with the spray to protect it against the elements. Been using this on my cars for years with no problems, but now I wonder if there's an alternative that might be better.
Harry
Harry