"Moisture" isn't the same as coolant. Find yourself some coolant -- anybody's will do -- and slop some on your garage floor or any non-porous surface. And wait for it to evaporate. It doesn't. Glycol holds on to the water, and prevents evaporation. You can let glycol-based coolant sit for weeks and it looks the same as when you poured it out.
Similarly, coolant soaked into the stator cannot be dried via heat nor airflow. You have to dilute the glycol significantly before you have any chance of drying it out.
Mine had corrosion on the stator laminations, but was dry up at the gearcase end of the stator cavity. The outer rotor bearing area was quite ugly, and I stopped driving it
immediately the first time I had an I/C warning.
That's why I pulled the rotor, suspended the LDU at a slight angle, and sprayed a water-based cleaner (very dilute) and used a sponge-like tool to remove as much corrosion as I could.
After running a lot of water over everything, spraying upward, downward, behind things, I then sprayed IPA in there, which dilutes water and helps drive it out to where you can mop it up, plus IPA
does evaporate. I blew warm air into it via a space heater for a week, testing the isolation resistance of the stator windings (using an insulation tester, not a DMM) daily.
You're not going to make any headway at all with a hairdryer unless you dilute the glycol. And pulling the rotor required special tools I had to make, for mine (others have better luck).