What I have done on headlights is take out the unit and bring it inside. Then use a hair blow dryer and blow air into the headlight from where the bulb plugs in. This should get the moisture out right away.
You will have to try to find out how it got in there in the 1st place though or it may just get water in it again. They should be sealed so something must have went wrong to get the water in there in the 1st place. Hopefully it may have just been one of the back caps that wasn't tightened all the way.
You will have to try to find out how it got in there in the 1st place though or it may just get water in it again. They should be sealed so something must have went wrong to get the water in there in the 1st place. Hopefully it may have just been one of the back caps that wasn't tightened all the way.