My Hella Micro DE foglights on my runner is corroded and I called Hella to inform them as somebody here posted sometime ago. The guy I talk to said they know about the problem and they will be sending me a new pair in a couple of days. Call 1-800-247-5924 and ask for Scott to help you out on your foglight corrosion problems.
Hope this helps.

George

 

When i mounted my foglights last week is opened them up and smeared a bit of vaseline aound the seal to ensure it was nicely water tight as i had the same problem on a set of spots!