Leaving it outside on a warm day should evaporate the remaining water into the air in the tube, but you would still need to exchange the moist air for dry air from outside. The baffle tube means you can't leave it face up or down and expect the air to find its own way out... Leaving it on it's side would be the best compromise, but of course the baffle will still prevent the air from easily getting out. The best option would be to take the corrector off...better you than me!
If you don't want to take the corrector off, or if it was me, I would put it outside on a warm day to let the whole thing warm up and evaporate the remaining water and put the Cat Cooler into it and leave it run for a couple of hours. The cooler would change the air in the tube easily, but I am guessing you don't have one. Otherwise you need some way of sucking the existing water laden air out of the tube. I have only had mine for 5 months so I can't say if it is "normal"...I suspect it is not.
Good luck!
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