Vinegar would probably be the best solution. You'll really want to get something to cover the lights and reflector, though. The salt can permanently discolor the reflector, reducing its effectiveness, and it can't be good for the lights either.
i use warm ro di water and a rag.... since i have the lumenarcs and they are perminantly mounted in my tank i try to clean them monthly.... salt will ruin and pit the reflectors..... keep it clean and you wont have to worry about replacing them as often...
shane
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