Moisture can seep in between the sheets of glass along the glue of laminated glass.
Not likely. The smog or film on the inside of the windshield is primarily comprised of outgassed silicones used to preserve the interiors of cars. You can use cleaners to soften, spread, and clean towels to remove, but as far as I understand, nothing will remove this.
As a potential hazard when the window fogs or when streaked during cleaning, not sure why the automakers have not addressed this issue, nor why there are not outgassing limits or standards that exist.
Why are there windshield wipers inside the car?
It should be inside the windshield washer fluid tank
Have the windshield removed and retapped.
The windshield washer pump is inside the wiper motor and serviced separately.
Could be the heater core.
I've replaced a front windshield before and although I cannot tell you the complete process I know that you must kick the old windshield out from the inside.
Moisture in the passenger cabin will cause the inside of the windshield to freeze up, during the winter time. The defroster should take care of this problem.
its inside the windshield washer fluid tank, you have to remove it to access the pump
The wiper motor is mounted on the left inside of the windshield frame on the same bracket as the VIN. Fold down the windshield and is fully accessible.
On the windshield frame, right in front of the driver, behind the dash pad. The motor mounts to the inside wall of the windshield frame and drives the linkage that is inside the frame.
The heater core is leaking coolant.
its inside the windshield water reservoir fixed inside fender of rh side