I just looked at mine and it is the same as yours.
There is spray that can prevent corrosion. WD40 may help but it might wash off.??? So it's a no win situation?
Can't seal it for fear of moisture collection but corrosion if not sealed.
That's what I was thinking that it should have a cosmetic/protector cover which at least would stop any kind of liquid from getting in there. It seems that if liquid was to get in there it would contain it and not let it drain.I am surprised that Lexus did not put a cosmetic cover over this connector. I think that a majority of vehicle owners only open their hood to add windshield washer fluid if they can figure out how to open it. The only time that they have seen under the hood is at the dealers when the vehicle was delivered. Readers of this forum are not among this group.
Valid point and adding to this, it might be worth it to ask someone that specializes in vehicle electrical system to get an opinion or some direction on what do here.Air dry. If its sealed in then it can just linger in there. That's the impression I am getting. I wouldn't mess with it, especially since if something does go wrong and you messed with it, it could void the warranty.