I dry one of mine out after every time I go to an automatic carwash. It's in good condition, but I guess the seal leaks a little. Not worth re-sealing in my opinion, but I think there is a DIY for that somewhere.
To dry it out, I just pull out a couple of the amber bulbs (turn signal, DRL, parking. Why are there so many?) and let it sit in the sun on a dry day. If that's not enough, put a small computer fan under the hood pointing into the housing while a couple bulbs are out.