When the polycarbonate lenses on the Grand Caravan clouded over it was because the UV protective layers, inside and out, had degraded. Oxidization etc. The UV from the lamps (big source!) and sun then attacked the polycarbonate.
I removed the lenses, then wet-sanded both sides starting with 1000 grit and worked to 4000 - sanding and washing with distilled water. Polished them with plain toothpaste and a microfiber cloth, but polishing compounds are good too. Replacement UV coating: Sylvania Headlight Restoration UV Block Clear Coat.
Take your time.
I removed the lenses, then wet-sanded both sides starting with 1000 grit and worked to 4000 - sanding and washing with distilled water. Polished them with plain toothpaste and a microfiber cloth, but polishing compounds are good too. Replacement UV coating: Sylvania Headlight Restoration UV Block Clear Coat.
Take your time.
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