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If they are OEM you can either seal where the lens meets the black housing w/ silicone OR open your headlight (if you have pre-03 headlights) w/ heat and put some more rubber butyl sealant around the edges and reseal.

Not sure about the aftermarket headlights, I guess either seal it w/ silcone or try and open it w/ heat, not sure if they will open or not?
 

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Sorry didnt know you had pre-face headlights. So you dont even need to heat them up they just unhook w/ the tabs to open them up.

Yeah you can buy new lens, that might solve the problem.
 

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Take the headlight assembly off of the car, open the faceplate, pour in some isopropol alcohol (about 1/4 cup), shake headlight to disperse alcohol through the headlamp assembly, pour out excess alcohol, allow assembly to dry completely before reassembly. You can also use a hairdryer to speed the process. Alcohol will bond with the water and take it with it when it evaporates.
 

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Take the headlight assembly off of the car, open the faceplate, pour in some isopropol alcohol (about 1/4 cup), shake headlight to disperse alcohol through the headlamp assembly, pour out excess alcohol, allow assembly to dry completely before reassembly. You can also use a hairdryer to speed the process. Alcohol will bond with the water and take it with it when it evaporates.
Good to know! Does the alcohol degrade the plastic?
 

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i also had some strange moisture inside the housing and it turned out that the leveling bubble had leaked all of its fluid out into the light body, you may not have to bother with resealing the light or anything just wont have a bubble for setting the level
 

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i also had some strange moisture inside the housing and it turned out that the leveling bubble had leaked all of its fluid out into the light body, you may not have to bother with resealing the light or anything just wont have a bubble for setting the level
That fluid actually is compass oil. The same oily fluid used in compasses. However, it does not leave condensation like water when it leaks. Just a oily film on the body and the lens but not vapor.
 
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