on my left headlight i have this area were it seems like soap or something got into the headlight. I have tried rubbing it with water to make sure its not on the exterior of the headlight. Well i decide to take it to nissan and they said it most likely is on the exterior and they wont warrenty it if it is. they said they will replace it for free but after nissan gets the old head light and determines its on the exterior of the light i would be charged $900 or whatever for the light. But if they determine its on the interior its free.... Anyone have any idea how i can make 100% sure the problem is on the interior and not the exterior