I noticed dripping of a clear watery liquid underneath the glovebox on the passenger side after a car wash. It appears its coming from this tube. What is this?
That's your blower motor. I had mine out to clean and oil it. I'm almost positive that clear plastic tube is to ventilate the motor to keep it cool.
The motor comes out quite easily, if you disconnect the wire harness and three screws, it comes right out. You might be able to see where the water is coming from if you remove the motor.