The best way to restore exterior black plastic trim I have found is using Meguiars Ultimate Black Plastic Restorer. Best for trim on Jeeps and Trucks.
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How to restore exterior black plastic trim - Page 2
The 10 Best Plastic Restorers in 2024 (Including Options for Exterior and Black Plastic Trim Restoration)
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Best Way to Restore Exterior Black Plastic Trim - Horsepower Hub
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How To CLEAN and Restoration of Faded Black Plastic Trim!