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On my old convertible the plastic window would go white with age. I would use 3m Clear Plastic Restorer and then 3m Clear Plastic Cleaner and Polisher to revive the plastic. After a good working the plastic would be clear once again and good as new. It would also remove scratches (with enough applications and work). If the platic window is going white us must use this product to cut into the corrosion. After some applications you can revert back to using plexus to clean it.
The 3m products are expensive and part of the marine range and will work on soft and hard plastics (I used to also use them on the screen of my motorbike to get out all the little scratches)
Hope this helps.
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