Re: Post face-lift headlight cleaning - Saab 9-5 Bulletin Board - Saabnet.com
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I've done this to several vehicles with good success.
A 'paint protection film' - Xpel, 3M, or other - should be considered a "must" final step, if you want the results of your labor to last. The OE polycarbonate lenses have a protective hardcoat on the outside, which usually is designed with a UV absorber package. The paint protection films (at least the better ones) are usually a non-yellowing polyurethane film and an adhesive loaded with UV absorber. The polyurethane film withstands the impact of sand and other junk without loosing its gloss, and the UV absorber in the adhesive protects the polycarbonate from solar degradation.
For one of the cars on which I did this, I got to do it twice because a shop did a 'courtesy wash' before I got the film on - they must have used a caustic detergent that attacked the bare polycarbonate, creating an instant yellowing. Thankfully it was only a few molecules thick and buffed back relatively easily.
Good luck; tell us how it went !
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