I saved a cell phone by setting it in the airstream from my room dehumidifier (or in front of the fridge at the bottom vent) overnight and then putting it in a sealed ziplock with as many silica gel drying packets you can get a hold of. I left it for a week and sure enough it fired right up.
The only problem with this is the battery situation. With the phone, I yanked the battery as soon as it got wet. With your tailcam, the metals in the battery (especially if they are lithium or metal hydride) may have reacted with the water and nuked the whole works.
You never know, it might work!