2015 Nissan Altima SE...low beam headlights work but appear dim. The low beam bulb cover INSIDE the headlight lens assembly has a milky white look, but the main headlight lens assembly doesn’t. Is there a way to clean the internal low beam bulb lens?

 

According to the information in this chart, the low beam headlight bulb is a H11. You can try cleaning the inside of the headlight lens with a cotton swab dipped in rubbing alcohol. If this does not work, you may need to replace the low beam bulb.

 

You can try removing it an purchase a product called "Shinex" from most Nissan Dealers. It will fix issue. Price is about $7.99 and it works