Well, to bring more focus to the discussion (although it's probably too late for that
), this particular plane was up to at least the bottom of the wing in flood waters after a hurricane (I should have been more specific - sorry!). I say "at least" because the photo I've seen of it which shows the water up to the bottom of the wing (it's a low-wing) was taken about 5 days after the storm, so the water could have receded by then.
The seller claims (and has documentation to show it) that it had a thorough going-over afterwards and he's been flying it for 2 years since.
The water must not have been up to the avionics, though, because they're still the ones that were there pre-flood. It did, however, cover the retractable gear.
As much as I'd like to believe it was cleaned up, I wonder about areas where the skins meet (edges of the ailerons and flaps, for example). It seems like salt buildup would be likely in those areas and would have been hard to clean out without taking the skins off.
I think I'll pass...maybe it would be OK, but I can't risk having to reskin it when (if) corrosion started rearing its ugly head a few years down the road.