I have King model. Since I've had it I get a cloudy door with dark black on the sides & corners.
I load N/S.
I've cleaned the glass & burned good dry spruce with very little creosote staining the glass.
My theory, is the birch bark being so oily (when it burns, it's dark black smoke like a burning tire) is one
problem & not burning hot enough for an extended period of time is another.
I'm burning good seasoned birch now (2yr old+) & the door is black in the corners & the rest of it is cloudy.
We have 6" wall here, good insulation in the ceilings, it gets too hot to burn on high without
having to open the windows.
I had some birch without bark & noticed I got less staining.
I'm not going to remove the bark from 12 cords of birch to keep the glass clean.
Im' not to worried about the dirty glass, I get 24 hr + burn times & have a warm house.
I burn 1/3 or 1/2 loads this time of year & get 12 - 16 hrs of heat.
When I burn a real hot fire, the soot gets burned of the glass all but the corners, but in a few hours the house is 74°f & climbing.
I turn the stove to 1 & I go outside to cool off.
I think I should have got the princess, maybe I could burn hotter.
Gas company hates me, (budget billing) & I use less gas in the winter than in the summer.
The solution may be to burn spruce, get shorter burn times, & cheaper to buy/cord & I got 16 - 18 hr burn times
last winter when I experimented for a week just burning a full load of spruce.
I turn the fan off allot too, stove is hotter that way (sometimes I get too much heat with the fan running.)
Also smaller loads on higher settings, (but it reduces burn times).
When winter sets in & we get 0°f & colder, see if burning hotter helps. It helps mine some but it's never totally clean.
Anyway my theory is the birch bark is one of the main issues of sooty glass.
I've thought about replacing the door with an all metal one so I don't see the soot.
I'd love to try some good dry oak sometime & see/prove birch bark is one of the issues.