Cracked, pittted, sandblasted, hazed, and fogged headlight lenses can be a dangerous liability. They drastically cut light output than even the best bulbs will not overcome. There are headlight restoration kits on the market but even polishing and filling will not last much longer than a couple of weeks. Don't prolong their replacement! Only a new set of lenses or housings will restore your lighting's performance. And installing new headlight assemblies is generally straightforward and easy on most cars. Note that some BMW headlight lenses are sealed to the housing with silicone and the only replacement lens comes with a new housing.
