I personaly do not see how you can offer an evaluation that is based on visual inspection only. In the case of damage sustained in the likes of Hurrican Frances wherby the building has been subjected to severe movement cables could have been stressed and weakened, some in-depth testing would be needed to find the true extent of the damage. In most cases would have thought complete rewiring would have been the only solution to be 100% sure.
Just my opinion of course.
Re: The contamination from salt water would have thought that there may be a spray available to neutralise the action. As its only a short term immersion. Be interesting to see what other members think.