How to Deal with Aging and Blurry Headlights?

[VonAllie]

Clean dust, dirt, and other debris from the surface of the headlights with a soft cloth. Be sure to use a professional car cleaning towel to avoid secondary damage to the lens. Wash the headlights with soapy water. Do not use laundry detergent (which is highly corrosive to the lens), as soapy water will not cause harm. After cleaning, polish the headlights with a clean soft cloth. Use polishing wax or polish to enhance the brightness and gloss of the headlights for maintenance.

[LeDerek]

I had yellowed headlights before and tried fixing them myself with decent results. First, prepare a restoration kit with various sandpapers and UV coating. Sanding is crucial: protect the surrounding paint with tape to avoid scratches. Start with lower grit sandpaper, like 1000-grit, using water and sand in one direction—no circular motions. Then switch to higher grit, like 2000-grit, to smooth the surface. Clean it, spray UV coating, and cure it for 15 minutes with the included UV lamp (or leave it in sunlight if no lamp). It does look much clearer afterward, but avoid back-and-forth sanding to prevent deeper scratches. Cost is just tens of RMB—way cheaper than replacing the housing.