After almost 1 1/2 weeks, the glass on the Alaska is still easily cleaned. I feel this is the easiest way to keep the glass clean:
As I mentioned earlier, I was no longer able to get the glass clean on the stove, after burning approx. 1 1/2 ton of coal. Even with thorough cleaning a brown film remained on the glass.
I finally removed the door and used Noxon and a sharp razor to scrape the coating off, took about 20 minutes. I then coated the window with a thick layer of Butcher's Floor Wax. After letting it dry for awhile I wiped it off. Butcher's wax has Carnuba wax in it, I suppose any Carnuba-based paste wax will work.
After restarting the stove the coating seemed to "melt" but it then hardened.
The glass still gets dirty, but I clean it with rags and water. When the stove is at low burn I shut the combustion fan and stoker motor off and open the door and spray water liberally on the glass (from a spray bottle) and wipe the glass off. I do this several times until it's clear again, and I mean it is clear.
I don't know how long this coat of wax will last, but so far so good.
It is imperative that the window be absolutely clean before applying the wax.
If anyone else tries this I would like to know how it works for you.