mine are already starting to look faded/cloudy. I guess they're probably not covered under warranty.

how do I clean/shine them?... just w/ regular metal/aluminum polish?

 

warranty covers them early on if stock available. but they just fade again anyway. metal polish does help even though they are plastic, why they fade. the rear piece along the rear window are chrome and stay shiny.

but elbow grease and metal/chrome polish do improve their appearance.

 

I would try to have them replaced, newer ones may be made better and hold up longer.