I bought a used Prius and headlights doesn't seem as bright as a new ones. It looks like it has a soft mist on the glass and my question would be, is there a possibility to change headlight glass only? What would be your advice how to make the glass look brighter? Thanks,
The plastic lenses can be polished to remove the fine scratches. There are a number of products that will work. Do a Google search for "Headlight Restoration". Rod
Actually the plastic lens does have a UV protective film. Eventually it will peel and then the plastic will yellow and turn brittle. If you polish the plastic that will also remove the UV protection.
You can shoot the lenses with a layer of clearcoat to give them back UV protection. Also, unless you're really patient, an orbital buffer is way too slow. A rotary, or even a cordless drill, with a 4" pad mounted is way faster.