My 2004 X5 4.4i has one diry headlamp. Is it moisture or dirt? It's like this all the time, so I don't think its condenstation, but I'm no expert.

I was reading a thread where sticking a vacuum cleaner into the headlamp for an hour fixed the problem? Where do I stick the vacuum in?

Or do I need to open everything up and use Windex on the inside? Any good threads I should read to learn how to open it up?

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