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You can also remove the headlight assembly from the car and use a blow dryer to dry it out. Of course you will need to figure why it's getting water inside before you reinstall it but that's going to be an easier proposition when it's off the car.
 

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But how easy/difficult is it to remove it? I’ve seen a YouTube video of someone removing it on a newer BMW and that was a nightmare! Just removing the plastics to get to it and the hidden screws is like a 45 minute ordeal or at least it felt that long!
As kevace82 suggests, it's very easy to remove the headlight assembly. You will need a torx bit with a long extension to access the rear screws that only need to be loosened 1 turn.

Removal of the lense is not required to dry it out. Simply remove the two or three rear access panels and blow the air through there to dry out the housing. You can then inspect the lense seal and make sure that the vent tube is clear. Mud dauber wasps like to plug the vent tube because it's the perfect diameter for them to lay eggs in.
 
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