I understand what you are saying and I agree with the logic, but I guarantee you that unless it is sealed in a vacuum or at a sub freezing temperature, water evaporates, it’s science. It is simply a matter of how long it takes to evaporate. But I do agree, if at all possible use the highest percentage isopropyl and it will evaporate that much faster and you will have more peace of mind. Simple exposure to water h20, however, does not cause oxidization, prolonged exposure to moisture certainly can though. but everyone is right, don’t take a chance, go with the best option available.
but I guarantee, it’s not the more or less evaporation that’s the issue at play - it all evaporates, it’s just the rate at which it’s state transitions from liquid to gaseous.