Water in the headlights - 2001 Saturn L-Series

ultimate cleaning

water is one reason but the main reason is to keep your lights from fogging up replace as soon as possible

This is a good write up of why headlights fog up or have water ingress.
http://www.popularmechanics.com/cars/how-to/repair-questions/how-to-prevent-foggy-headlights

You cant, just replace both theadlights. they are yellowed and hazed over anyhow. you wont believe how good new headlights will be for you.

Your best bet is to go to the salvage yard and get a used one.Make sure it doesn`t have water in it.Get the complete headlamp assembly.Good luck.

You'll need the following. Painter's tape or Masking tape, 2000, 2500, 3000 grit sandpaper, bucket of water, headlight polish (PlastX, etc) and microfiber cloths

Mask off around the light so you don't have to worry about sanding your paint if your hand slips.

Soak the sand papers for at least 15 minutes. The more water the better Using the lowest grit, start sanding in ONE DIRECTION ONLY,(side to side). Keep the sandpaper wet and dip it in your bucket of water frequently. Now dry the headlight and it should look all hazy

Switch to the next finer grit, and repeat the step above, but this time go in the OPPOSITE DIRECTION (up and down). Keep using water
Dry it again, and it will look better than the first time.

Repeat the process again with your finest grit. Again, OPPOSITE DIRECTION with plenty of water. Dry it off. It should look relatively new at this point. Remove the tape as it will contain bits of grit from the sandpaper.

Generously apply the headlight polish in a circular motion to the headlight

Using your microfiber cloth, rub off .. repeat several times with FRESH rags until the polish is dry and gone.

Now the headlight will look like new

Most headlights lens are sealed up to prevent this problem. A broken seal or a crack somewhere opened up to let in moisture.
You can drill a small hole on the lowest part of the plastic headlight housing to let the water drain out. Or, replace the plastic headlight assembly with a new sealed one.The plastic headlights turn yellow and cloud up over time (not because of moisture inside, because it's plastic getting ruined by the weather and the sun). This problem reduces headlights from putting more light on the road.
The only thing you can do with moisture inside the headlights is to drain out the water that builds up. The seals on the headlights are bad right now and are going to keep letting moisture in. I would replace the both headlight assemblies for new sealed, clear ones.

There are headlight assemblies available on Ebay for as low as $50 each. I removed mine and drilled a couple 3/8" holes in the bottom to drain the water, and had no more problems.
The headlights are easy to remove. There are two white tabs on each light. Pull them up about 1/2" and the headlight can be pulled out straight forward (after unplugging the wires).

the only way to get the water out isto drill a hole in the bottom of the headlight assemly. they don't come apart. drill very slowly.

hope this helps
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watre in a head light is not good
It will short out the bulb but more importantly will rust out the reflector of the light
If the car is under warranty , get it replaced
if not get a sealed unit from the wreckers/junk yards