Bought a used QX a few weeks ago and the LH headlight housing had a lot of condensation in it. Non-Infiniti dealership put in writing they would fix it, but they are an hour away and I who knows if they would be able to fix it anyway.
Decided to use my heat gun and some Stanley head screw drivers and a pry bar. Took some work but they finally came apart. Pulled the old seal out and replaced with some stuff I bought for one of my old cars to reseal a headlight but never got around to it.
Used compressed air to dry it out as best I could and then a microfiber towel to get what was left.
I should have heated up the new seal before pressing the housing back together to make it easier but I was able to work my way around the perimeter with some long nose vice grips to give it a good squeeze.
I just did this last night and re-installed this morning so I haven't tested yet but it looks a lot nicer than it did before