How can i get the moisture out? I don't want it to turn the lens the dirty yellow color seen on some cars.

 

First, moisture in your headlight lens will not turn them yellow. That comes from aging plastic and eventually happens to all lenses. The moisture may cause your bulb to blow more often, however.

The moisture in the headlamp is a problem I had as well. It was fixed under warranty by replacing the lens cover (transparent portion), and using a sealant used between the clear lens and the headlamp assembly. The problem has not returned. Perhaps you could buy a used lens and go to an auto parts store and purchase a water/weatherproof sealant and apply it around the perimeter of the lens where it makes contact with the rest of the headlamp assembly.

A cheaper alternative would be to drill a small hole in the very bottom of the headlamp lens. This will allow accumulated water to drain out and dry out the interior of the lens.