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It'll dry out eventually, but some water displacement spray like WD40 or GT86 could come in handy if there are any wet connections.
I take it the back of the lights are dry?
I wouldn't strip the shell back completely, just repaint what's needed to sort any chips/scratches/rust and whatever.
Remove all running gear, replace bushes and underseal the car while everything is off.
Getting someone to do you a full new wiring loom will probably be nearly £1k on it's own...