I have a 2011 e350 Mercedes, One of the small round driving lights in the front lower valance will get a little moisture build up on the inside of the lense off and on, mostly after a rain storm. I sealed the outer edge of the lense with a small amount of clear silicone to see if that was where it was forming and it helped for a few weeks, now its back again. I heard years back that somebody drilled a tiny hole in the lense to let air in but I'm not sure if that will work. Anyone have any ideas or have had this problem before? Thanks

 

Hello and welcome to the forum! Take a look at the link below to a helpful video showing a possible solution. Hope this helps you out a bit. Please let us know if you have any other questions or if we can assist with any future part needs.

https://mercedessource.com/problems/...our-headlights