Called it.
I opened the cap today at lunch and also took out one of the little ‘marker’ bulbs which is ‘open air’ inside the light and by 4:30 it was completely gone. Promptly closed everything up. Should be good to go.
I was surprised how fast it dried. I figured I’d have to do this across two days or so.
Edit: The housing does have water spots now…so I dunno how I feel about that. I’ll see what it looks like after an exterior wash (car is filty right now). If it bothers me or is noticeable, I will have to open it up and clean it.