Power windows are not working?

I don't see the picture; it must not have been uploaded. But if the connectors are that bad, I would suggest you get this terminal cleaner, Deoxit D5 costs a little bit more but this is the best electrical cleaner there is. And the switch should just be replaced because it's probably full of corrosion by now.
And you may need to replace the door seal if that's what is leaking, because water may be getting down into other connectors in the lower left side of the dash.